Help me choose
Our pick: Dolphin Sigma
Dolphin Sigma is the Pool Express pick in this matchup. Dolphin Sigma includes filtration for sand, pollen and other fine debris. Dolphin Sigma adds gyroscope-assisted navigation.
ProLine
Dolphin Sigma
Inground pools up to 50 ft that need floor, wall and waterline cleaning, with fine debris.
Triton
Dolphin Triton PS Plus
Inground pools up to 50 ft that need floor, wall and waterline cleaning.
Why Dolphin Sigma is our pick
Dolphin Sigma
Inground pools up to 50 ft that need floor, wall and waterline cleaning, with fine debris.
$2,399
Buy Dolphin SigmaDolphin Sigma or Dolphin Triton PS Plus: our take
Dolphin Sigma and Dolphin Triton PS Plus 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 Sigma lists 2 active brushes, SmartNav 3.0 with gyroscope navigation, and Triple commercial-grade DC motors. Dolphin Triton PS Plus lists 2 active brushes and CleverClean navigation.
Filtration and debris
Dolphin Sigma includes Standard filter and NanoFilters; Dolphin Triton PS Plus includes Basket. That gives Dolphin Sigma the clearer documented edge for fine silt, pollen and sand. Dolphin Triton PS Plus has the better documented path for bulky leaves and larger debris.
Controls and day-to-day ownership
Dolphin Sigma provides a weekly timer, smartphone control, and included remote control; Dolphin Triton PS Plus provides a weekly timer and smartphone control. Dolphin Sigma uses a 55 ft corded cable with an anti-tangle swivel, while Dolphin Triton PS Plus uses a 60 ft corded cable with an anti-tangle swivel.
Price, warranty and the decision
Dolphin Sigma is listed at $2,399 and Dolphin Triton PS Plus at $1,199; Dolphin Triton PS Plus is $1,200 less. Dolphin Sigma lists a 3-year warranty compared with 2 years for Dolphin Triton PS Plus. Pool Express pick: Dolphin Sigma. Dolphin Sigma includes filtration for sand, pollen and other fine debris. Dolphin Sigma adds gyroscope-assisted navigation. Choose Dolphin Triton PS Plus when it is the better fit for shoppers prioritizing the lower $1,199 starting price.
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 Sigma | Dolphin Triton PS Plus |
|---|---|---|
| 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 | No | YesEdge |
| Automatic scheduling | Yes | Yes |
| Smartphone app | Yes | Yes |
| Anti-tangle swivel | Yes | Yes |
| 3-year warranty | YesEdge | 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 Sigma stands out
Dolphin Sigma is the better fit for inground pools up to 50 ft that need floor, wall and waterline cleaning, with fine debris.
- Includes filtration for sand, pollen and other fine debris
- Adds gyroscope-assisted navigation
- Carries a 3-year warranty instead of 2 years
Where Dolphin Triton PS Plus stands out
Dolphin Triton PS Plus is the better fit for shoppers prioritizing the lower $1,199 starting price.
- Includes a large-debris bin or bag for leaves
- Is listed $1,200 lower
Dolphin Sigma vs Dolphin Triton PS Plus 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 Sigma | Dolphin Triton PS Plus |
|---|---|---|
| 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. |
| Starting price | $2,399 | $1,199 |
| 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 | Standard filter, NanoFilters | Basket |
| Scheduling | Weekly schedule + app | Weekly schedule + app |
| App and remote | App + included remote | App control |
| Cable | 55 ft with anti-tangle swivel | 60 ft with anti-tangle swivel |
| Robot weight | 24.6 lb | Not listed |
| Warranty | 3 years | 2 years |
Choose Dolphin Sigma
Dolphin Sigma is the Pool Express pick in this matchup. Dolphin Sigma includes filtration for sand, pollen and other fine debris. Dolphin Sigma adds gyroscope-assisted navigation.
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