Help me choose
A stronger Pool Express option
BWT RC50 and Dolphin M400 are compared feature by feature below. For a stronger Pool Express option, consider Clear S. 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.
What we recommend instead
Clear S
Inground pools up to 50 ft that need floor, wall and waterline cleaning, with fine debris.
$1,749
Buy Clear SBWT RC50 or Dolphin M400: our take
BWT RC50 and Dolphin M400 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. Dolphin M400 has a published maximum pool length of 50 ft; the other model does not have a verified length in our source material. BWT RC50 cleans floor; Dolphin M400 cleans floor, walls, and waterline. BWT RC50's documented cleaning system includes 2 active brushes.
Filtration and debris
Dolphin M400 has documented included filtration—Standard filter and UltraFilter—while the other model's included media is not fully published. Dolphin M400 has the clearer documented edge for fine silt, pollen and sand.
Controls and day-to-day ownership
BWT RC50 provides no fully published timer, app or remote specification; Dolphin M400 provides smartphone control.
Price, warranty and the decision
BWT RC50 is listed at $1,399 and Dolphin M400 at $1,599; BWT RC50 is $200 less. Each lists a 3-year manufacturer warranty. BWT RC50 and Dolphin M400 each have a specific fit, but neither is the Pool Express pick for this job. Our better alternative is Clear S. 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 | BWT RC50 | Dolphin M400 |
|---|---|---|
| Cleans the pool floor | Yes | Yes |
| Climbs and cleans walls | No | YesEdge |
| Scrubs the waterline | No | YesEdge |
| Fine-debris filter included | No | YesEdge |
| Large-debris filter | No | No |
| Automatic scheduling | Not listed | Not listed |
| Smartphone app | Not listed | Yes |
| Anti-tangle swivel | Not listed | Yes |
| 3-year warranty | Yes | Yes |
| No recharging between cycles | Not listed | 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 BWT RC50 stands out
BWT RC50 is the better fit for shoppers prioritizing the lower $1,399 starting price.
- Is listed $200 lower
- Cleans the pool floor
Where Dolphin M400 stands out
Dolphin M400 is the better fit for inground pools up to 50 ft that need floor, wall and waterline cleaning, with fine debris.
- Cleans the floor, walls and waterline instead of stopping below the tile line
- Includes filtration for sand, pollen and other fine debris
- Has documented smartphone control
BWT RC50 vs Dolphin M400 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 | BWT RC50 | Dolphin M400 |
|---|---|---|
| Best fit | Inground pools that need floor cleaning. | Inground pools up to 50 ft that need floor, wall and waterline cleaning, with fine debris. |
| Starting price | $1,399 | $1,599 |
| Pool type | Inground | Inground |
| Maximum pool length | Not listed | Up to 50 ft |
| Cleaning coverage | Floor | Floor, Walls, Waterline |
| Power | Not listed | Corded |
| Filtration | Not listed | Standard filter, UltraFilter |
| Scheduling | Not listed | Not listed |
| App and remote | Not listed | App control |
| Cable | Not listed | 60 ft with anti-tangle swivel |
| Robot weight | Not listed | Not listed |
| Warranty | 3 years | 3 years |
Consider the stronger Pool Express option
BWT RC50 and Dolphin M400 are compared feature by feature below. For a stronger Pool Express option, consider Clear S. Inground pools up to 50 ft that need floor, wall and waterline cleaning, with fine debris.
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