Dolphin Sigma Review (2026)
WiFi, dual brushes, large basket. This is the premium pick.
The Dolphin Sigma is the best robot for pool owners who want full app control, aggressive dual-brush scrubbing, and a three-year warranty. The $200 premium over the Nautilus CC Plus is justified if your pool has texture, algae history, or if you want to control it from your phone.
Full Specs
| Pool Type | In-ground |
| Max Pool Length | 50 ft |
| Cleaning Path | Floor + Walls + Waterline |
| Cycle Time | ~2.5 hours |
| Filter Type | Top-load, large basket |
| Filter Fineness | 50–70 microns |
| Cord Length | 60 ft swivel |
| Scheduler | Weekly via app |
| App Control | WiFi + smartphone app |
| Weight | 18.5 lbs |
| Warranty | 3 years |
Pros & Cons
- ✓WiFi app control — start/stop/schedule from phone
- ✓Dual counter-rotating brushes (more scrubbing power)
- ✓Larger filter basket (fewer empties)
- ✓50-micron fine filtration option
- ✓3-year warranty (1 year more than Nautilus)
- ✓App includes manual directional steering mode
- ✗$699 — $200 more than Nautilus CC Plus
- ✗Heavier at 18.5 lbs
- ✗App can be glitchy on older Android devices
- ✗Manual directional control is basic vs. true remote
Full Review
The Dolphin Sigma occupies the premium tier of the in-ground robot market, and it earns the position. The headline upgrade over the Nautilus CC Plus is the dual brush system — two counter-rotating brush rolls that agitate the pool surface more aggressively in both directions. The difference is visible on pool surfaces with any texture: rough plaster, pebble aggregate, or tile floors where algae gets into grout lines.
The WiFi app integration is polished for a pool robot. You can start a cleaning cycle from anywhere, adjust the schedule, run "spot cleaning" mode that concentrates on one area, and get a notification when the cycle completes. The app works well on iOS; Android performance has been slightly less consistent in our testing.
The larger filter basket means fewer interruptions during operation. On our heavy-debris test pool (lots of trees overhead), the Nautilus needed the filter emptied every 2–3 cycles. The Sigma went 4–5 cycles between empties.
The 3-year warranty adds meaningful value to the premium price. With a $699 robot, knowing Dolphin covers it for three years takes the sting out of the purchase.
Who It's For
In-ground pool owners with textured surfaces, algae history, or those who want WiFi app control. Worth the premium if any of those apply.
Pool owners with smooth, well-maintained pools — the Nautilus CC Plus cleans those just as well for $200 less. Above-ground pool owners.