Three flagships, 3-year warranty

Dolphin M-Series Robotic Pool Cleaners

M-Series is a premium Dolphin line: three 50 ft robots with app control, a weekly timer and a 3-year warranty as standard. The M400 runs a 2.5-hour cycle on a fine filter kit, the M550 moves to a combined filter kit, and the M600 adds Multi-Layer filtration and ships with its caddy.

Every M-Series model side by side Free shipping · 30-day in-pool trial · expert help
See Every M-Series Model Compare Specs
Dolphin Sigma robotic pool cleaner waiting beside a backyard pool
Built for the weekly routine
Is this the right line?

Who the Dolphin M-Series Lineup Suits

Choose the M-Series when you want ProLine™-class coverage and warranty with the app included. All three clean floor, walls and waterline on 50 ft pools with the app; the M600 is the one to pick for fine debris because of its Multi-Layer filter and included caddy.

The whole M-Series line Every model is below with its price, specs and its own page; the comparison table puts them side by side.

Good fit when

  • Inground pools to 50 ft with a lot of wall and waterline
  • Owners who want app scheduling and a 3-year warranty
  • Pools with fine dust and pollen (M600)

Strengths

  • 3-year warranty on every model
  • myDolphin™ Plus app and weekly timer throughout
  • Multi-Layer filtration and caddy on the M600

Before you buy

  • Priced with the ProLine™ flagships
  • No leaf-bag option like the Premier's Multi-Media™
  • Heavy; plan on the caddy

Next step: The Dolphin Sigma is the closest match for the M600, with the same 3-year warranty and app control.

Every model

The Dolphin M-Series Lineup

Each card opens the model's own page with the full specs, reviews and buying options.

Dolphin M400
Dolphin

Dolphin M400

$1749

Best for: In-ground pools up to 50 ft, floor, walls & waterline

View Details
Dolphin M550
Dolphin

Dolphin M550

$1999

Best for: In-ground pools up to 50 ft, floor, walls & waterline

View Details
Sold Out Dolphin M600
Dolphin

Dolphin M600

$1799

Best for: Premium connected cleaner with caddy

View Details
Side by side

Compare the Dolphin M-Series Lineup

Every M-Series model on published specs and current price.

Model Dolphin Dolphin M400 Dolphin M400
$1749
View details 		Dolphin Dolphin M550 Dolphin M550
$1999
View details 		Dolphin Dolphin M600 Dolphin M600
$1799
View details
Power Corded Corded Corded (low-voltage)
Pool size In-ground up to 50 ft In-ground up to 50 ft Up to 50 ft
Coverage Floor, walls & waterline Floor, walls & waterline Floor, walls & waterline
Control MyDolphin™ Plus app MyDolphin™ Plus app myDolphin™ Plus app + weekly timer
Filtration Fine Filter Kit + Ultra-Fine Filter Kit Combine Filter Kit + Ultra-Fine Filter Kit Dual-level top-load cartridges
Cycle time 2.5 hours 2 hours 2 hours
Warranty 3 years 3 years 3 years
Dolphin M-Series buying guide

What separates the models, and which current Dolphin to price each one against.

M400, M550, M600

The M400 covers 50 ft pools floor to waterline in a 2.5-hour cycle with a fine filter kit. The M550 runs a 2-hour cycle with a combined filter kit. The M600 adds Multi-Layer filtration and comes with its caddy and Wi-Fi app control.

Against ProLine™

Feature for feature, the M600 is the Sigma's twin and the M400 sits between the Quantum and Premier. The ProLine™ page lists the three flagships side by side if you are weighing them up.

In stock at Pool Robots

Frequently Bought Instead

The three robots shoppers of the Dolphin M-Series line most often order from us: comparable coverage, in stock today, free shipping and a 30-day in-pool trial.

Clear S Robotic Pool Cleaner

Clear S

Best for: Premium clean without the UV price

CoverageFloor, walls & waterline

Pool sizeUp to 50 ft

Warranty3 years

$1749 See this cleaner
Quick answers

Dolphin M-Series Questions

Which M-Series is the best value?

The M400: the same 50 ft floor-to-waterline coverage, app and 3-year warranty as the M600, with a fine filter kit instead of Multi-Layer filtration.

What warranty does the M-Series carry?

3 years on the M400, M550 and M600.

Does the M400 have app control?

Yes. All three M-Series robots connect to the myDolphin™ Plus app and have a weekly timer.

More Dolphin lineups

Browse Every Dolphin Line

Dolphin ProLine™ 3 models · The flagship inground line Dolphin Max-Series™ 3 models · HyperBrush™, MaxBin™, SmartNav 2.0™ Dolphin Nautilus 5 models · Dolphin's best-known value line Dolphin Explorer 8 models · Seven models, 30 to 50 ft Dolphin Liberty 4 models · No cable, no power supply by the pool Dolphin Wave 9 models · Built for hotel, club and competition pools Dolphin EON 4 models · Cordless, app-connected, 50 ft Dolphin Active 9 models · Nine models, 30 to 50 ft Dolphin Premium 7 models · Seven models, Max-Series™ features Dolphin S-Series 6 models · Six models, 30 to 50 ft Dolphin T-Series 8 models · Eight models, 30 to 50 ft Dolphin Proteus 5 models · The DX-Series Dolphin Advantage 3 models · Simple, wall-climbing value Dolphin Classics 6 models · Standalone and legacy models