Dolphin Sigma Review

Here at Poolbots, we’ve tested countless pool cleaners, but the new Dolphin Sigma stands out. If you're searching for a robotic pool cleaner that combines advanced technology with exceptional performance, look no further. After a month of rigorous testing in four different pools, I’m here to tell you why the Dolphin Sigma is in a class of its own.

Is the Dolphin Sigma Worth the Investment?

The short answer: Absolutely. If you're looking for the best of the best, the Dolphin Sigma is it. It’s on the pricey side, but that’s expected for what is essentially a commercial-grade pool robot. As a part of the new Dolphin ProLine, the Sigma’s advanced gyroscope, 3-year warranty, waterline cleaning, and powerful vacuuming performance make it worth every penny.

Why the Dolphin Sigma is the Best Robotic Pool Cleaner of 2025

The Dolphin Sigma is built on the same platform as the more expensive Dolphin Wave 60 commercial pool robot, but with additional features that residential pool owners love, like the myDolphin Plus app, Weekly Timer, NanoFilters, and an extended 3-year warranty—all at a lower price.

This shared foundation is the secret to the Dolphin Sigma's exceptional performance. Let’s break down the benefits of this shared platform and explore why the Sigma is several notches above the rest of the Dolphin lineup.

Gyroscopic Mobility: Advanced Sensor Technology

A gyroscope is a device that measures and maintains orientation and angular velocity. In the Dolphin Sigma, the gyroscope provides constant and precise information about the robot’s position and movement. This advanced sensor technology allows the Sigma to navigate your pool with exceptional accuracy, maintaining optimal cleaning paths and ensuring comprehensive coverage.

How Gyroscopes Improve Pool Cleaning

Gyroscopes are commonly used in aircraft and spacecraft to stabilize and control their movements. By incorporating similar technology, the Dolphin Sigma can monitor and adjust its orientation, direction, and rotation in real-time. This results in more efficient and thorough cleaning, as the Sigma can seamlessly transition from the pool floor to the walls and waterline, tackling dirt and debris in hard-to-reach areas.

What Comes with the Dolphin Sigma?

A Durable, Over-Engineered Design

First, you have the robot itself. The body of the Sigma is robust, offering long-term reliability and reduced maintenance. Built on a commercial platform, the Sigma’s construction means it's less likely to suffer from wear and tear, providing peace of mind to pool owners who want a dependable cleaning solution.

You can feel how durably built it is, and the shape is hydrodynamic. It has a low center of gravity and a buoyant handle that helps it adhere to the top of the wall and improves underwater mobility.

NanoFiltration: Capturing the Finest Particles

The Sigma’s filtration system is impressive. The Gen-2 filtration system, with NanoFilters and Standard Filters, captures a wide spectrum of debris sizes, ensuring that pool water remains crystal clear. This system, designed to meet commercial standards, is a significant upgrade over typical residential pool cleaners.

Two Sets of Filters for Maximum Versatility

The Dolphin Sigma includes two sets of filters: NanoFilters and Standard Filters. The standard filters are great at maximizing flow rate but won't capture microscopic debris like sand, silt, and algae very well. That’s where Dolphin’s NanoFilters come in—they capture small debris that other filters miss, filtering fine particles that standard filters can't.

Easy Setup and Operation with the Dolphin Sigma

Getting the Sigma up and running is fast and simple. Its power supply is surprisingly straightforward, considering all you can do with it. You can set the Sigma to run directly from the power supply or open the myDolphin Plus app.

Advanced Scheduling and Remote Drive Features

From the app, you get advanced scheduling options and remote drive capability. You can set specific days and times for the Dolphin Sigma to run or control and spot-clean areas of your pool.

The Dolphin Sigma's Coverage and Cleaning Power

Once we saw the Sigma in action, it became clear that it offers unprecedented coverage. The Sigma utilizes SmartNav 3.0 technology to map your pool, providing complete cleaning coverage.

Three Powerful Motors and SmartNav 3.0

The Dolphin Sigma has three powerful commercial-grade motors, which no other residential robotic pool cleaner can match. Combined with SmartNav 3.0, this ensures that every corner of your pool is thoroughly cleaned.

Unique Features of the Dolphin Sigma

HyperGrip Tracks and Anti-Tangle Swivel

The Sigma’s HyperGrip tracks and patented anti-tangle swivel cable enhance its movement and coverage, ensuring it reaches every nook and cranny without getting tangled.

Quad Scrubbing Brushes for Deep Cleaning

The Sigma's four powerful brushes, including split-spinning brushes