Help me choose
A stronger Pool Express option
Dolphin Quantum and Dolphin S50 are compared feature by feature below. For a stronger Pool Express option, consider Dolphin Cayman. Inground and above-ground pools up to 40 ft that need floor and wall cleaning.
ProLine
Dolphin Quantum
Inground pools up to 50 ft that need floor, wall and waterline cleaning, with fine debris.
What we recommend instead
Dolphin Cayman
Inground and above-ground pools up to 40 ft that need floor and wall cleaning.
$1,079
Buy Dolphin CaymanDolphin Quantum or Dolphin S50: our take
Dolphin Quantum and Dolphin S50 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
Dolphin Quantum is intended for inground pools, while Dolphin S50 is intended for above-ground pools. Dolphin Quantum is rated for pools up to 50 ft; Dolphin S50 is rated up to 30 ft. Dolphin Quantum cleans floor, walls, and waterline; Dolphin S50 cleans floor. Dolphin Quantum lists 2 active brushes, SmartNav 2.0 navigation, and Dual DC motors. Dolphin S50 lists 1 active brush.
Filtration and debris
Dolphin Quantum includes XXL MaxBin and NanoFilters; Dolphin S50 includes Basket. That gives Dolphin Quantum the clearer documented edge for fine silt, pollen and sand.
Controls and day-to-day ownership
Dolphin Quantum provides a weekly timer, smartphone control, and included remote control; Dolphin S50 provides one-touch starts and power-supply controls. Dolphin Quantum uses a 60 ft corded cable with an anti-tangle swivel, while Dolphin S50 uses a 40 ft corded cable. Dolphin Quantum is listed at 18.3 lb versus 14 lb for Dolphin S50; that 4.300000000000001 lb difference matters when lifting the robot from the pool.
Price, warranty and the decision
Dolphin Quantum is listed at $1,649 and Dolphin S50 at $649; Dolphin S50 is $1,000 less. Each lists a 2-year manufacturer warranty. Dolphin Quantum and Dolphin S50 each have a specific fit, but neither is the Pool Express pick for this job. Our better alternative is Dolphin Cayman. Inground and above-ground pools up to 40 ft that need floor and wall cleaning.
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 Quantum | Dolphin S50 |
|---|---|---|
| Cleans the pool floor | Yes | Yes |
| Climbs and cleans walls | YesEdge | No |
| Scrubs the waterline | YesEdge | No |
| Fine-debris filter included | YesEdge | No |
| Large-debris filter | Yes | Yes |
| Automatic scheduling | YesEdge | No |
| Smartphone app | YesEdge | No |
| Anti-tangle swivel | Yes | Not listed |
| 3-year warranty | No | No |
| 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 Quantum stands out
Dolphin Quantum is the better fit for pools up to 50 ft.
- Cleans the floor, walls and waterline instead of stopping below the tile line
- Uses the high-capacity XXL MaxBin for easier top-load debris handling
- Includes filtration for sand, pollen and other fine debris
- Uses 2 active brushes instead of 1
Where Dolphin S50 stands out
Dolphin S50 is the better fit for shoppers prioritizing the lower $649 starting price.
- Is listed $1,000 lower
- Weighs 14 lb versus 18.3 lb
Dolphin Quantum vs Dolphin S50 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 Quantum | Dolphin S50 |
|---|---|---|
| Best fit | Inground pools up to 50 ft that need floor, wall and waterline cleaning, with fine debris. | Above-ground pools up to 30 ft that need floor cleaning. |
| Starting price | $1,649 | $649 |
| Pool type | Inground | Above-ground |
| Maximum pool length | Up to 50 ft | Up to 30 ft |
| Cleaning coverage | Floor, Walls, Waterline | Floor |
| Power | Corded | Corded |
| Filtration | XXL MaxBin, NanoFilters | Basket |
| Scheduling | Weekly schedule + app | One-touch start |
| App and remote | App + included remote | Power-supply controls |
| Cable | 60 ft with anti-tangle swivel | 40 ft |
| Robot weight | 18.3 lb | 14 lb |
| Warranty | 2 years | 2 years |
Consider the stronger Pool Express option
Dolphin Quantum and Dolphin S50 are compared feature by feature below. For a stronger Pool Express option, consider Dolphin Cayman. Inground and above-ground pools up to 40 ft that need floor and wall cleaning.
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