Help me choose
A stronger Pool Express option
Dolphin M400 and Dolphin M600 are compared feature by feature below. For a stronger Pool Express option, consider Dolphin Quantum. Inground pools up to 50 ft that need floor, wall and waterline cleaning, with fine debris.
M-Line
Dolphin M400
Inground pools up to 50 ft that need floor, wall and waterline cleaning, with fine debris.
M-Line
Dolphin M600
Inground pools up to 50 ft that need floor, wall and waterline cleaning, with fine debris.
What we recommend instead
Dolphin Quantum
Inground pools up to 50 ft that need floor, wall and waterline cleaning, with fine debris.
$1,649
Buy Dolphin QuantumDolphin M400 or Dolphin M600: our take
Dolphin M400 and Dolphin M600 are compared on pool fit, cleaning reach, debris handling, controls and ownership details. The recommendation is based on the job the robot must do—not a simple feature count.
Pool fit and cleaning reach
Both robots are intended for inground pools. Both are rated for pools up to 50 ft. Each cleans floor, walls, and waterline, so coverage alone does not separate them.
Filtration and debris
Dolphin M400 includes Standard filter and UltraFilter; Dolphin M600 includes Basket and UltraFilter. Both have documented fine-debris media, so basket capacity and ease of cleaning matter more than fine-particle capability. Dolphin M600 has the better documented path for bulky leaves and larger debris.
Controls and day-to-day ownership
Dolphin M400 provides smartphone control; Dolphin M600 provides a weekly timer, smartphone control, and included remote control. Both use a 60 ft corded cable with an anti-tangle swivel.
Price, warranty and the decision
Dolphin M400 is listed at $1,599 and Dolphin M600 at $1,999; Dolphin M400 is $400 less. Each lists a 3-year manufacturer warranty. Dolphin M400 and Dolphin M600 each have a specific fit, but neither is the Pool Express pick for this job. Our better alternative is Dolphin Quantum. Inground pools up to 50 ft that need floor, wall and waterline cleaning, with fine debris.
Feature check: what each robot actually has
A green check means the feature is documented as included. A red X means it is documented as absent. A dash means the source does not make the feature clear.
| Feature | Dolphin M400 | Dolphin M600 |
|---|---|---|
| Cleans the pool floor | Yes | Yes |
| Climbs and cleans walls | Yes | Yes |
| Scrubs the waterline | Yes | Yes |
| Fine-debris filter included | Yes | Yes |
| Large-debris filter | No | YesEdge |
| Automatic scheduling | Not listed | Yes |
| Smartphone app | Yes | Yes |
| Anti-tangle swivel | Yes | Yes |
| 3-year warranty | Yes | Yes |
| No recharging between cycles | Yes | Yes |
| Built-in UV-C water treatment | No | No |
Unknown is not treated as “no.” Specifications come from the product pages, current catalog records and manufacturer material collected for this site.
Where Dolphin M400 stands out
Dolphin M400 is the better fit for shoppers prioritizing the lower $1,599 starting price.
- Is listed $400 lower
- Standard filters and ultrafine filters
Where Dolphin M600 stands out
Dolphin M600 is the better fit for inground pools up to 50 ft that need floor, wall and waterline cleaning, with fine debris.
- Includes a large-debris bin or bag for leaves
- Top-load filter basket and ultrafine filters
Dolphin M400 vs Dolphin M600 specifications
Use pool fit first. Price and app control do not make up for a robot that cannot cover the length or surfaces you need cleaned.
| Specification | Dolphin M400 | Dolphin M600 |
|---|---|---|
| Best fit | Inground pools up to 50 ft that need floor, wall and waterline cleaning, with fine debris. | Inground pools up to 50 ft that need floor, wall and waterline cleaning, with fine debris. |
| Starting price | $1,599 | $1,999 |
| Pool type | Inground | Inground |
| Maximum pool length | Up to 50 ft | Up to 50 ft |
| Cleaning coverage | Floor, Walls, Waterline | Floor, Walls, Waterline |
| Power | Corded | Corded |
| Filtration | Standard filter, UltraFilter | Basket, UltraFilter |
| Scheduling | Not listed | Weekly schedule + app |
| App and remote | App control | App + included remote |
| Cable | 60 ft with anti-tangle swivel | 60 ft with anti-tangle swivel |
| Robot weight | Not listed | Not listed |
| Warranty | 3 years | 3 years |
Consider the stronger Pool Express option
Dolphin M400 and Dolphin M600 are compared feature by feature below. For a stronger Pool Express option, consider Dolphin Quantum. Inground pools up to 50 ft that need floor, wall and waterline cleaning, with fine debris.
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