Robotic pool cleaner comparison

Dolphin T55i vs Dolphin Triton PS

A side-by-side comparison of pool fit, cleaning coverage, filtration, controls and the better Pool Express option.

By Brian Williamson, Pool Express product specialist
Updated November 9, 2026

Better alternative

A stronger Pool Express option

Dolphin T55i and Dolphin Triton PS 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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T-Line

Dolphin T55i

Inground pools up to 50 ft that need floor, wall and waterline cleaning, with fine debris.

Listed price $1,699

View better alternatives

Triton

Dolphin Triton PS

Inground pools up to 50 ft that need floor, wall and waterline cleaning.

Listed price $1,099

View better alternatives

A better alternative

What we recommend instead

Pool Express pick

Dolphin Quantum

Inground pools up to 50 ft that need floor, wall and waterline cleaning, with fine debris.

$1,649

Buy Dolphin Quantum

Buying guidance

Dolphin T55i or Dolphin Triton PS: our take

Dolphin T55i and Dolphin Triton PS 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 Triton PS's documented cleaning system includes 1 active brush.

Filtration and debris

Dolphin T55i includes Basket and UltraFilter; Dolphin Triton PS includes Basket. That gives Dolphin T55i the clearer documented edge for fine silt, pollen and sand.

Controls and day-to-day ownership

Dolphin T55i provides a weekly timer, smartphone control, and included remote control; Dolphin Triton PS provides a weekly timer and power-supply controls. Both use a 60 ft corded cable with an anti-tangle swivel.

Price, warranty and the decision

Dolphin T55i is listed at $1,699 and Dolphin Triton PS at $1,099; Dolphin Triton PS is $600 less. Each lists a 2-year manufacturer warranty. Dolphin T55i and Dolphin Triton PS 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 T55i	Dolphin Triton PS
Cleans the pool floor	Yes	Yes
Climbs and cleans walls	Yes	Yes
Scrubs the waterline	Yes	Yes
Fine-debris filter included	YesEdge	No
Large-debris filter	Yes	Yes
Automatic scheduling	Yes	Yes
Smartphone app	YesEdge	No
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 T55i stands out

Dolphin T55i is the better fit for owners who put smartphone control first.

Includes filtration for sand, pollen and other fine debris
Adds smartphone control

Where Dolphin Triton PS stands out

Dolphin Triton PS is the better fit for shoppers prioritizing the lower $1,099 starting price.

Is listed $600 lower
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