Help me choose
Our pick: Dolphin Quantum
Dolphin Quantum is the Pool Express pick in this matchup. Dolphin Quantum uses the high-capacity XXL MaxBin for easier top-load debris handling. Dolphin Quantum is listed $50 lower.
ProLine
Dolphin Quantum
Inground pools up to 50 ft that need floor, wall and waterline cleaning, with fine debris.
T-Line
Dolphin T55i
Inground pools up to 50 ft that need floor, wall and waterline cleaning, with fine debris.
Why Dolphin Quantum is our pick
Dolphin Quantum
Inground pools up to 50 ft that need floor, wall and waterline cleaning, with fine debris.
$1,649
Buy Dolphin QuantumDolphin Quantum or Dolphin T55i: our take
Dolphin Quantum and Dolphin T55i 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. Dolphin Quantum's documented cleaning system includes 2 active brushes, SmartNav 2.0 navigation, and Dual DC motors.
Filtration and debris
Dolphin Quantum includes XXL MaxBin and NanoFilters; Dolphin T55i includes Basket and UltraFilter. Both have documented fine-debris media, so basket capacity and ease of cleaning matter more than fine-particle capability.
Controls and day-to-day ownership
Both models provide 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 Quantum is listed at $1,649 and Dolphin T55i at $1,699; Dolphin Quantum is $50 less. Each lists a 2-year manufacturer warranty. Pool Express pick: Dolphin Quantum. Dolphin Quantum uses the high-capacity XXL MaxBin for easier top-load debris handling. Dolphin Quantum is listed $50 lower. Choose Dolphin T55i when it is the better fit for 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 Quantum | Dolphin T55i |
|---|---|---|
| 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 | Yes | Yes |
| Automatic scheduling | Yes | Yes |
| Smartphone app | Yes | Yes |
| Anti-tangle swivel | Yes | Yes |
| 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 shoppers prioritizing the lower $1,649 starting price.
- Uses the high-capacity XXL MaxBin for easier top-load debris handling
- Is listed $50 lower
Where Dolphin T55i stands out
Dolphin T55i is the better fit for inground pools up to 50 ft that need floor, wall and waterline cleaning, with fine debris.
- Top-load filter basket and ultrafine filters
Dolphin Quantum vs Dolphin T55i 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 T55i |
|---|---|---|
| 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 | $1,649 | $1,699 |
| 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 | XXL MaxBin, NanoFilters | Basket, UltraFilter |
| Scheduling | Weekly schedule + app | Weekly schedule + app |
| App and remote | App + included remote | App + included remote |
| Cable | 60 ft with anti-tangle swivel | 60 ft with anti-tangle swivel |
| Robot weight | 18.3 lb | Not listed |
| Warranty | 2 years | 2 years |
Choose Dolphin Quantum
Dolphin Quantum is the Pool Express pick in this matchup. Dolphin Quantum uses the high-capacity XXL MaxBin for easier top-load debris handling. Dolphin Quantum is listed $50 lower.
More robotic pool cleaner comparisons
Keep comparing without rebuilding the same specification table yourself.
Clear UV vs Clear S
Pool Express pick: Clear UV
Dolphin Quantum vs Clear S
Pool Express pick: Dolphin Quantum
Dolphin Premier vs Dolphin Sigma
Pool Express pick: Dolphin Premier
Dolphin Premier vs Dolphin Quantum
Pool Express pick: Dolphin Quantum
Dolphin Sigma vs Dolphin Quantum
Pool Express pick: Dolphin Quantum
Dolphin Cayman vs Dolphin Escape
Pool Express pick: Dolphin Cayman