Help me choose
A stronger Pool Express option
BWT RC50 and Dolphin Liberty 400 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.
Liberty
Dolphin Liberty 400
Inground and above-ground pools up to 33 ft that need floor, wall and waterline cleaning without a cord.
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 QuantumBWT RC50 or Dolphin Liberty 400: our take
BWT RC50 and Dolphin Liberty 400 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
BWT RC50 is intended for inground pools, while Dolphin Liberty 400 is intended for inground and above-ground pools. Dolphin Liberty 400 has a published maximum pool length of 33 ft; the other model does not have a verified length in our source material. BWT RC50 cleans floor; Dolphin Liberty 400 cleans floor, walls, and waterline. BWT RC50's documented cleaning system includes 2 active brushes.
Filtration and debris
Dolphin Liberty 400 has documented included filtration—Basket and UltraFilter—while the other model's included media is not fully published. Dolphin Liberty 400 has the clearer documented edge for fine silt, pollen and sand. Dolphin Liberty 400 has the better documented path for bulky leaves and larger debris.
Controls and day-to-day ownership
BWT RC50 provides no fully published timer, app or remote specification; Dolphin Liberty 400 provides a weekly timer and smartphone control.
Price, warranty and the decision
BWT RC50 is listed at $1,399 and Dolphin Liberty 400 at $1,429; BWT RC50 is $30 less. Each lists a 3-year manufacturer warranty. BWT RC50 and Dolphin Liberty 400 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 | BWT RC50 | Dolphin Liberty 400 |
|---|---|---|
| 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 | YesEdge |
| Automatic scheduling | Not listed | Yes |
| Smartphone app | Not listed | Yes |
| Anti-tangle swivel | Not listed | Not listed |
| 3-year warranty | Yes | Yes |
| No recharging between cycles | Not listed | No |
| 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 $30 lower
- Cleans the pool floor
Where Dolphin Liberty 400 stands out
Dolphin Liberty 400 is the better fit for owners who value cordless handling more than automatic scheduling and continuous power.
- Cleans the floor, walls and waterline instead of stopping below the tile line
- Includes filtration for sand, pollen and other fine debris
- Includes a large-debris bin or bag for leaves
- Has documented smartphone control
BWT RC50 vs Dolphin Liberty 400 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 Liberty 400 |
|---|---|---|
| Best fit | Inground pools that need floor cleaning. | Inground and above-ground pools up to 33 ft that need floor, wall and waterline cleaning without a cord. |
| Starting price | $1,399 | $1,429 |
| Pool type | Inground | Inground, Above-ground |
| Maximum pool length | Not listed | Up to 33 ft |
| Cleaning coverage | Floor | Floor, Walls, Waterline |
| Power | Not listed | Cordless |
| Filtration | Not listed | Basket, UltraFilter |
| Scheduling | Not listed | Weekly schedule + app |
| App and remote | Not listed | App control |
| Cable | Not listed | Cordless |
| Robot weight | Not listed | 17.9 lb |
| Warranty | 3 years | 3 years |
Consider the stronger Pool Express option
BWT RC50 and Dolphin Liberty 400 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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