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Dolphin M400

Deluxe Class

The M400 provides highly efficient pool cleaning for pools up to 50ft in length. Advanced systems ensure accurate scanning for systematic coverage of floor, walls and water-line, leaving clean and hygienic water throughout.

Dolphin M400 Feature - Active Brushing
Active Brushing

Scrubs away algae and bacteria

CleverClean Technology

Advanced scanning ensures complete pool coverage in 2.5 hours or less

Easy Clean Filtration

Remove filter cartridges to simply rinse & reload.

Lightweight Design

Easy to lift and handle – only 24 pounds

Questions & Answers

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  • Question
    What is the typical life span of a Dolphin robot?
    Answer
    The Dolphin is designed to last many seasons. However, the lifespan differs from Dolphin to Dolphin. Many different factors play a role, such as amount of use, pool chemistry, and pool surface.
  • Question
    What is the purpose of the floats on the handle of the cleaner?
    Answer
    The floats are on the arm of the Dolphin. The floats are used to assist the buoyancy of the cleaner when turning on the bottom of the pool and scrubbing the waterline. To adjust the buoyancy, slide the float out on one side of the Dolphin. If the cleaner continues to have issues turning or scrubbing the waterline, pull the opposite float outward as well.
  • Question
    What are the voltage requirements for the Dolphin power supply?
    Answer
    The Dolphin requires a standard 120v outlet for power.
  • Question
    What are the plastic wrappers around the white foam climbing rings?
    Answer
    These are to protect the climbing rings during shipping. Please be sure to remove before the initial cycle.
  • Question
    What are the ideal operating temperatures for my Dolphin cleaner?
    Answer
    Dolphin robotic pool cleaners are best used in temperatures between 43 and 93 degrees.
  • Question
    Should I remove the Styrofoam from the motor unit?
    Answer
    No, do not remove, this is not packing material. These help the Dolphin with buoyancy within the pool.
  • Question
    My white climbing rings are dented, are they damaged?
    Answer
    No, the indentions on the rings are normal and due to the product settling during shipping. The rings will reshape once saturated with water.
  • Question
    How do I remove the Dolphin from the pool?
    Answer
    Using the floating cable, pull the robot to the edge of the pool. Grab the handle and remove the robot from the water. Do not pull the robot out of the water using the cable. Place the pool cleaner on the side of the pool to allow the water to drain.
  • Question
    How can I get a manual for my Dolphin?
    Answer
    To view the manual for your Dolphin, please visit the link below.
    http://manuals.maytronics.com/
  • Question
    Does the Dolphin pool cleaner ‘learn’ my pool?
    Answer
    No, the Dolphin pool cleaner performs a new mapping sequence on each cleaning cycle.
  • Question
    Is my Dolphin "remote controllable"?
    Answer
    Yes, this Maytronics Dolphin robotic pool cleaner has access to the Manual Drive (joystick) via the MyDolphin Application. Please visit the App store via your Smart Phone and search keyword Maytronics. Download the App from the App store, launch the app and follow the prompts. Compatibility: Android version 4.3 or later; Apple iPhone 4S or higher/ starting at version 6.0 operating system. Requires connection with 3G/4G network with a minimum of 60% signal strength. Bluetooth feature must be enabled on the phone.
  • Question
    Does my Dolphin have Bluetooth Capability?
    Answer
    Yes, this Dolphin robotic pool cleaner has Bluetooth capability.
  • Question
    Can you use this cleaner in an in-ground pool?
    Answer
    Yes. The this Dolphin robotic pool cleaner is designed for the in-ground pool application.
  • Question
    Can you use Dolphin cleaners in hot tubs or ponds, etc.?
    Answer
    No, the Dolphin is not designed to clean hot tubs or ponds.
  • Question
    Can you leave the power supply out in the weather?
    Answer
    The power supply is water resistant but not waterproof. Please cover the power supply if inclement weather approaches. Do not leave the power supply in standing water. Do not allow the power supply to be submerged in the pool.
  • Question
    Can you leave the Dolphin in the Water?
    Answer
    It is safe to leave your Dolphin cleaner in the water when not in use. However, (when adding chemicals to the pool) please remove the Dolphin until the proper chlorine and PH balance are obtained.
  • Question
    Can I use my Dolphin pool cleaner with an extension cord or surge protector?
    Answer

    The Dolphin is not designed to be used with an extension cord. There are many different types of extension cords and we do not recommend using one. However, it is safe to use a surge protector with the Dolphin. This will help protect the Dolphin from surges in power such as thunderstorms.

  • Question
    Can I use my Dolphin in an Infinity pool?
    Answer
    Not all Dolphins are suitable for infinity pools, please contact Maytronics directly or your local Dolphin retailer for information regarding the models that are suitable for this pool type.
  • Question
    Can I use a Dolphin pool cleaner with my fiberglass or vinyl pool surface?
    Answer
    Yes, the Dolphin is suitable to use in fiberglass or Vinyl pool surfaces.
  • Question
    Can I purchase a Dolphin pool cleaner online with warranty service?
    Answer
    Maytronics offers several pool cleaners both via brick and mortar stores and via internet dealers that include warranty rights. Please refer to the ‘Residential pools’ section of our website for our product listings.
  • Question
    Can I purchase a Dolphin pool cleaner and use it abroad?
    Answer

    Dolphin pool cleaners purchased in the United States must be operated in North America in order to retain the warranty rights. Using any Dolphin pool cleaner outside of North America (that is purchased in the US) voids the warranty service agreement.

  • Question
    Can I leave the power supply unit outside in the elements?
    Answer
    The power supply unit is an electrical device which must be protected from the elements. When in use the unit needs to remain dry. Do not submerge the power supply unit in water as this will damage the internal components.
  • Question
    Are Dolphin pool cleaners safe to use when I'm swimming in my pool?
    Answer
    Dolphin pool cleaners are safe to use for the general public, however, (for safety precautions) we do not recommend swimming while the cleaner is in use. We also do not recommend leaving the cleaner in the pool for long extended periods of time.*

     

    *Please note the pool cleaner may stay in the water when using features such as the weekly timer for automating cleaning when you are away from your home.

Customer Reviews

Dolphin M400 Robotic Pool Cleaner

Based on 48 reviews

Share your thoughts!

4.73 out of 5 stars

48 reviews

Let us know what you think...

What others are saying

  1. Donald Pacheco

    5 out of 5 my pool boy

    Donald Pacheco

    I love my Dolphin I have had other pool cleaners and they don’t last this so far has been going strong I clean it after it does the work and in the winter I clean it and put it in the basement where it does not go below 50 degrees. Hopefully it will last a few years but I would buy another one if the need arises. We have such a short season June to September but I love my little cleaner.

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  2. Patrick Clynes

    5 out of 5 Enjoying our pool time!

    Patrick Clynes

    We love our dolphin! Even though we only spend weekends at our house with the pool, cleaning is so easy. We just put in the dolphin on Friday evening and once again on Sunday and it cleans our pool beautifully every time.

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  3. Jim Paliotta

    5 out of 5 M400

    Jim Paliotta

    Love it. Performs very well. Had a pool cleaner that ran through the filter which did not perform as well is the self contained filters and did not go up the side walls.

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    • Maytronics US

      Maytronics US

      Hi Jim,

      We are glad that you made the switch to Maytronics Dolphin M400 cleaner. Thanks for being a valued customer. Happy pool season!

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  4. T Kinney

    4 out of 5 Perfect......Almost

    T Kinney

    Going into our third season with our M400. A great product and I would rate it absolutely perfect but for one thing. I find that it does not actually clean the waterline as a continuous operation. The machine climbs the side of the pool and cleans an area about its own width then goes back to the bottom and on to another area. I have never seen it completely clean the waterline for the full circumference of our 20 X 40 liner pool. No complaints about any other features. The M400, overall, does a great job and I absolutely recommend it.

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  5. Dave Chance

    4 out of 5 Much better than my last Dolphin

    Dave Chance

    I bought and used a Dolphin Diagnostic between 8 and 10 years ago. It did a nice job cleaning until the memory partially failed and it then would only go into about 3/4 of the pool. Also, the bag was a major pain to clean. The new M400 is greatly improved in both the coverage of the pool (20′ x 40′ gunite) and the 2 plastic/screen collectors are easy to remove and clean. The swivel device for the hose is an improvement, but still requires some kink straightening. Overall, a very good cleaner.

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  6. Jimmy

    5 out of 5 Love my Dolphin!

    Jimmy

    I have a fiberglass pool and had used an older model that lasted over 8 years.During that time, I never had to manually vacuum my pool. The only issue I had was that it would hang up on the main drain because it only had two brushes. I purchased the M400 because it had a 3 brushes and it never hangs up! I really like the easy clean filters. The only down side of the M400 is the weight. I don’t have an issue getting it out of the pool, but it is a struggle for my wife. I would definitely recommend a Dolphin to anyone look for a great pool cleaner.

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  7. Al Watson

    5 out of 5 The best Robot made.

    Al Watson

    I have my Dolphin M400 for three years now. Never had any problems at all. It cleans my pool in about 45 minutes. Just make sure that you clean the filters after every use. Love it.

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  8. Ana V Benitez

    5 out of 5 DOLPHIN M400 GREAT TIME SAVER

    Ana V Benitez

    Before I bought the Dolphin M400 my husband would spend hours sucking out the dirt in the pool through a hose that hooks up to the skimmer sending the dirt to the filter. Now he just throws the Dolphin M400 in the water and it sucks the dirt into the filters inside the Dolphin M400, hence extending the life of the pool filter and he leaves the Dolphin unattended for whatever time he likes and goes on to do other things or simply have fun watching it.

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  9. Austin Javes

    5 out of 5 Almost perfect

    Austin Javes

    I haven’t had a bit of trouble with this machine. The only blemish to its operation is that it sometimes doesn’t cover the whole pool and then I have to go to all that trouble of pressing a button again.

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  10. Joe Whitbeck

    5 out of 5 I'm a big fan of Dolphin Products

    Joe Whitbeck

    The M400 does a fantastic job keeping the pool clean and me happy. The worst part of owning a pool is the upkeep. The M400 does the hard work for you – cleaning. Put it in the pool, turn it on the desired duration and sit back and watch it scour the bottom of your pool picking up just about everything it comes near. It’s also easy to clean. The new cartridge systems are a breeze to get out, clean and replace. I won’t own a pool without a Dolphin product swimming at the bottom.

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  11. Judy Medvid

    5 out of 5 Best purchase ever!

    Judy Medvid

    I use to dread summer with all the work of vacuuming my 20×40 pool. Now it’s on automatic pilot with my Dolphin. It keeps the water perfectly clean. Just the way I like it!!

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  12. George Hallas

    5 out of 5 Great addition

    George Hallas

    Works well and provides more free

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  13. Richard Rossy

    5 out of 5 a unbelievable product...M400

    Richard Rossy

    I purchased my Dolphin M400 in August 11, 2017. My pool is 33 years old and rather large 44×27 feet with a 10 foot deep end. Up until last year, I cleaned my pool manually, always believing that Robotic pool cleaners would never come close to a manual clean, that is a brush attached to a vacuum system.

    Well I was wrong, my Maytronic M400 is a unbelievable product and happy to say that I have retired from cleaning my pool manually. The M400 does the same job equally as well, maybe better…

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  14. Terry Trent

    5 out of 5 Awesome machine

    Terry Trent

    The most bang for the money!!! We have been using the M400 for over a year and it paid for it self quickly and my wife and I just love the way it cleans everything, sides bottom along the waterline it is just awesome . It even filters the water with the paper filters installed !!!

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    • Maytronics US

      Maytronics US

      Hi Terry,
      That clean waterline is everything! We are happy to hear that your family is enjoying your Maytronics Dolphin Cleaner. Happy pool season!

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  15. Augie Pellegrini

    5 out of 5

    Augie Pellegrini

    Simply awesome how much debris it picks up. Very easy to clean with top loading cartridges. Happy to be done with bag systems. Wish the top doors stayed closed a little tighter.

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  16. Jerome Lawson

    4 out of 5

    Jerome Lawson

    Spend lots of time cleaning the filters

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  17. Denise Hester

    5 out of 5

    Denise Hester

    Great pool vacuum!

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  18. Jim

    5 out of 5 Excellent Results

    Jim

    We have had this now 3 years and no problems. It’s pretty smart, but it rarely misses the debis in the pool. I have the remote which works great. Battery just died last week, but I will replace this week. A nice touch for focusing the unit. It does not pick up the acorns well, but I consider that a very minor issues. The cardboard-type filters are my favorite over the mesh filters that come with the unit. Well worth the extra expense. They have lasted the full 3 years.

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    • Maytronics US

      Maytronics US

      Hi Jim,

      Thank you for being a loyal customer. Happy pool season!

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  19. David Jo Ann Haynes

    5 out of 5 Dolphin pool sweep M400

    David Jo Ann Haynes

    Wish we purchased sooner. Does a great job

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  20. Larry Faust

    4 out of 5 Almost Perfect

    Larry Faust

    A great machine that does a fine job cleaning. I wish a little more effort was made to make the filter cartridges a little sturdier but other than that its an A+ all the way.

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  21. Christy B

    5 out of 5

    Christy B

    We LOVE our Dolphin, it does a great job of keeping our pool clean. Saves us so much time and work. We have a pebblecrete finish and tile mosaics and it cleans everything, except the top step. We use it almost daily during pool season because we enjoy a clean pool. The old vacuum was a pain with having to first brush down the walls, then drag out the hose, hook it up, and spend all that time and energy hand vacuuming. Now we just put the Dolphin in, push a button and enjoy letting it do all the work. Only regret is we wish we had gotten it sooner.

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  22. Albert St. Pierre

    5 out of 5 Love it

    Albert St. Pierre

    Does the job as advertised.

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  23. Marc Downing

    4 out of 5 Great Pool Robot

    Marc Downing

    My M400 does a great job of keeping my pool sparkling clean. Watching it work, it generally gets 90-95% of the pool cleaned. I do have a fiberglass freeform so the bot doesn’t get the top step or in one of the tighter curves but its consistent on the other cleaning. little elbow grease on those 2 spots and the robot does the rest.

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  24. Tony Ciccone

    5 out of 5 Phenomenal pool cleaner !

    Tony Ciccone

    I purchased the dolphin M 400 swimming pool cleaner for my inground swimming pool and I couldn’t be more happier my pool has never look cleaner it does the walls does the floors it does the steps it’s very easy to use .There is a light that goes on if the cartridges are dirty .to remove the cartridge it takes all of a minute I hose it down put it back in the machine and put it backinto the pool to clean again I have a 16 x 28‘ inground pool and it cleans it in within an hour I couldn’t be more happier I would definitely buy another Dolphin pool cleaner

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  25. Greg Onjack

    4 out of 5 Quality Time with Friends and Family

    Greg Onjack

    I’ve been a pool owner for over 40 years and kept putting off buying a robot. Just didn’t think they were at the level of my “manual” vacuuming. We moved to a home in NC and the pool we inherited came with a Polaris robot. Amusing as it was, it basically stirred-up the water so the pool filter could clean the finer water dust and debris. The netted bag let much of the fine particles through and I had to keep the booster pump going while it ran, costing more money. My local pool company talked me into buying one of these Dolphins and it was the best thing I’ve ever done for me and my pool. It never “stirs-up” debris and cleans my large L-shaped pool in approximately 3 hours. Now I have more time to spend enjoying the pool with friends and family and enjoying a really clean pool!

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  26. Cristy

    5 out of 5 Best thing ever!!

    Cristy

    Made taking care of my pool so easy! No more paying someone to do it and/or accommodating their schedule.

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  27. Andy

    5 out of 5 Love this little guy!!

    Andy

    I LOVE this Dolphin! The M400 is the absolute best investment we have made for our pool! Is it heavy? Maybe, but it is full of water when pulling it out of the pool after all and it is a machine!! Do you have to clean out the filters…well of course you do! I have yet to brush my pool in the two years I have owned our M400 and our 40×18 pool remains crystal clear with zero issues. Our model came with both the paper filters and the mesh filters, you can always buy extras on Amazon if necessary. Wonderful product, perfect with the app so you can control it if needed. There is nothing to complain about with this awesome pool cleaner!

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  28. Elizabeth

    5 out of 5 Love it!

    Elizabeth

    It is a bit heavy. It’s not too bad when putting it into the pool But it is particularly heavy when pulling it out of the pool. But it does a wonderful job of cleaning. Our pool has never been this clean. It’s great to be able to turn it on and let it go. And a bit mesmerizing to watch it working!

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  29. Ken

    4 out of 5 Does it's Job

    Ken

    Works excellent! Only complaint is it is a bit bulky. Cleans very well. Climbs partway up the walls.

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  30. Charles

    5 out of 5 Save Time and Enegry !

    Charles

    Excellent product which produces outstanding results. Purchased end of the summer, notice how well it performed, just open pool and it has lived up to its rating. I also own small Aqua King which I use for light cleaning. With all the pollen , I highly recommend the M400, ease of entry, easy to clean filters which is #1 in my mind.

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  31. Leo Neil Ligon

    5 out of 5 Excellent robotic vacuum pool cleaner

    Leo Neil Ligon

    Reliable and excellent pool vacuum cleaner. This is the first pool vacuum cleaner in our 18x36ft rectangular vinyl liner salt water pool. The cleaning takes 3 hours, about 90% are covered, which is excellent in robotic pool cleaner standards today. Highly recommended pool robotic vacuum cleaner.

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  32. Bret Andrews

    5 out of 5 The BEST

    Bret Andrews

    this is the best pool cleaner on the market.

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  33. Richard - Spring Texas

    5 out of 5 M400 overall performance and unfortunate Power cord failure

    Richard – Spring Texas

    The in-pool M400 is excellent. I have a very unique shaped pool with a 6 ft wide beach approach at a 90 degree angle to the rest of the pool. The M400 does a fantastic job of learning the pool and cleaning it. After 13 months of usage the M400 quit. I took it to the store where I purchased it and they determined the power cord had a manufacturing problem that lead to the failure. They corrected the problem with a complete new cord, at no cost to me, being under Warranty. The cord replacement was going to take 4-5 weeks so they gave me their store demo unit. This kind of service reinforced my decision to buy at a store versus online. I am so pleased. The unit is back and once again working perfectly.

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  34. Edward

    2 out of 5 Disappointing to say the least.

    Edward

    Used it for a full season and it still had not mapped the entire pool. many spots are left that are simply not cleaned. Does not climb stairs well either. For the money I expected more. Would not buy this product again. The only positive I can find is that the unit is easy to clean, which does not make up for the extra time I need to spend cleaning the missed areas.

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  35. Donald Kazawic

    5 out of 5 M400

    Donald Kazawic

    This cleaner is by far the best thing i purchased for our pool. You just place it in and walk away. The pool has stayed cleaned and freed me up to spend more time in the pool. The 3 wheeled vacuum was driving me crazy, always tangled up and never cleaned the pool. My dolphin M400 gets all the fines in the water that you can’t even see. I saw that my local pool store had one to demo and as soon as i tried it for a day i was sold on it.

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  36. Larry Burns

    5 out of 5 sure beats Polaris Booster cleaner

    Larry Burns

    By far the best cleaner we have ever used, started off with Letro Legend that came with pool, ok but, not great, then purchased Polaris, little better, but not considering a booster pump and motor is used. Enter Dolphin M400, after some consideration and wondering if cleaner worth the price. We quickly got over what seemed like sticker shock when the improvement was evident from the first use. We recommend this unit as we have been well pleased. Thanks Maytronics.

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  37. Frank Ruggerie

    5 out of 5 Hard to express just how GREAT this tool is!

    Frank Ruggerie

    Forget the expense of pop-up floor-systems and let this robot loose in your pool. It normally cleans the floors, walls and tile of a 38,000 gallon gunnite pool with contour surfaces in three (3) hours. I have three seasons (around 200 cleanings) on this Dolphin M-400. The power-cord was replaced at no-charge and I purchased a second set of filters. At some point I expect it will need the “rollers” replaced and hope there will be a convenient source to provide that service.
    So far, this little workhorse has been bulletproof.

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  38. Ruben Quintanilla

    5 out of 5 Easy to use

    Ruben Quintanilla

    I’ve had this unit about a year now. Very easy to use. Cartridges easy to remove and clean. Doesn’t leak debris back into the pool when removing to clean like my last unit. Love the built in timer on the power supply.

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  39. Sue Fraser

    4 out of 5 Does a really nice job!

    Sue Fraser

    I love the ease and convenience of this robotic cleaner. I used to dread the vacuuming and now I just toss the Dolphin in the pool and let it go. I have an in-ground 18×36, and I typically have to run it twice through to get it fully vacuumed. I do need to manually do the corners of the pool, since the Dolphin never gets those, which it why I gave 4 stars and not 5, but overall it was a good investment and has served me well.

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  40. Mike

    5 out of 5 Great value

    Mike

    Saves time and effort keeps pool clean and works on side of pool. Get value, owned for three seasons without any problems

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  41. Thom Manchester

    5 out of 5 love my Dolphin M400

    Thom Manchester

    I’ve tried Polaris(horrible),Aquabot (not to bad) but I love the Dolphin M400. The ease of cleaning is the best, just rinse the filter and pop it back in. The unit covers the pool area perfectly. My pool is 16’x36′ 10 ft. deep end inground. I like that it climbs the walls. I use to scrub the walls by hand, not anymore.

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  42. LRaines

    4 out of 5 Dolphin pool cleaner

    LRaines

    Works great, not perfect, but certainly easy to use and no labor for me. Sometimes have to run the cleaner 2 cycles if the pool is very dirty. Heavy to lift out of the water but I was expecting that since I had read the reviews. Filters are easy to clean and they really do pick up small particles. No complaints – I’m very happy we purchased this after many years of hand vacuuming, and later using a cleaner that runs off the skimmer . Would advise anyone to buy if they are looking for an automatic cleaner.

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  43. S. A. Martinez

    4 out of 5 EXCELLENT VACUUMING, but POOR HANDLE SLOT INSTRUCTIONS (after 2 years, still trying to figure it out)

    S. A. Martinez

    My “buddy” really takes the cleaning part of the bottom of the pool out of my chores to do, but I didn’t really come across an easy to understand instruction/explanation on how to use the handles and their different available positions……………….

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  44. Jim Phalen

    5 out of 5 Year 3 and All Is Well

    Jim Phalen

    The best pool vacuum cleaner I have owned.
    Runs circles around those “rubber band” vacuums.
    Its been a blessing.

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  45. Jr

    5 out of 5 Wish I had one sooner

    Jr

    Two pools, two M400s. Works great! Beats the Polaris hands down. Get one, you you’ll be glad you did.

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  46. Alan Blatterman

    5 out of 5 Clean pool

    Alan Blatterman

    The Dolphin M4000 is an awesome cleaner. I just drop it into the pool and a few hours later the is clean. Then I take the Dolphin out, clean the filters and put it away. My pool is now very clean. It gets even the smallest sand/dirt particles that were not gotten when I use to clean by hand vacuum.

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  47. Bill

    5 out of 5 Hands down the best!!!

    Bill

    This cleaner is the best!!!! Owned a Polaris and it did not even come close to the cleaning performance of my dolphin M400. Better versatility, duel types of cleaning and does the job in half the time. I expect it will save a ton in electricity not having to run a booster pump for an inpool cleaner, so add that to the plus’s!!!! Great product and well worth the investment!!!

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  48. Bill

    5 out of 5 Pac Man

    Bill

    We have been using the M400 for more than nine months, and very pleased with it’s performance. The M400 is used on a three day interval…one day on two days off, unless they is allot of wind. The unit is used on a pebble sheen pool surface, and does a quality job, the unit can not maneuver in tight corners, one just needs to be aware of this short coming. The middle roller does an great job on the pool surface. The filters have easy top access, and very easy to clean. The filtration system has extended the pools main filters from three months to a four month , may be a five month clean cycle. A good investment one of my neighbors also purchased a M400 after we used our unit in his pool, which made a significant improvement in the cleanliness in their pool . Maytronics , needs to provide a replacement parts kit to it customer…I see the need to replace the tracks in six to nine months.

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Dolphin M400

Deluxe Class
Model #99991046-USBLE

Dolphin M400 Robotic Pool Cleaner
Cleaning CoverageFloors, Walls, Waterline
Automated Weekly TimerYes
Caddy IncludedIncluded
Weight24 lbs
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