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AI-powered smart device monitors your pool chemistry 24/7 from your phone.
Convenient storage and easy transport for your pool robot.
Weather-resistant cover protects your robot from sun and rain.
The Sigma's advanced Dual Stabilizers, Triple Motors + Gyroscope allow it to clean like never before.
Manually control, schedule, and read advanced stats about each clean right from Sigma's app.
Advanced gyroscopic sensors allow Sigma to clean deeper than any other pool robot.
With Sigma's patented no tangle swivel, the robot can travel freely throughout your pool.
Clean small particles other robots cannot capture. Sigma includes the fine and NanoFilter™ cartridge sets.
Built on the ProLine™, Sigma's three motors are larger and boast the most power of any Dolphin robot.
Take whatever preconceived notions you may have about pool robots and throw them out. The all-new Sigma has set a new standard with unparalleled gyroscope technology and a powerful triple motor design. Now WiFi and app enabled.
Our most advanced filters yet. The Dolphin Sigma includes NanoFilters™ - as they are standard on all ProLine™ pool robots. These filters capture more than the standard filters on other robotic pool cleaners and are found only on the most powerful robots in the Dolphin product range.
Under the lens of a powerful microscope, the Nanofilter's micro-pore spun-bonded polyester fabric reveals a captivating tapestry of intersecting fibers. This intricate mesh allows water to flow freely while effectively trapping minuscule particles. With its deep pleats and impressive gunk-trapping capabilities, the Nanofilter stands out from the crowd. Furthermore, its pleated design offers a significant advantage—a larger surface area for capturing a greater volume of waterborne impurities, all while maintaining optimal water flow.
So what exactly makes the Dolphin Sigma the most progressive pool cleaner in the world? It’s rather simple. The ProLine™'s Sigma provides visionary mobility, inspiring design and a whole new focus on sustainability. The result is a technologically superior robotic pool cleaner. The absolute best warranty available and legendary Dolphin pool cleaner performance are standard. Discover new groundbreaking features that represent the current state of pool cleaner technology.
It’s the best Dolphin pool robot ever. It’s easy to see why the new Dolphin Sigma is the answer to the changing demands of pool owners everywhere as it redefines performance in a pool robot. With groundbreaking gyroscope technology, commercial grade motors, and a level of efficiency never seen before, the future has already begun. The newest Dolphin ProLine™ robot features not one, not two but three highly efficient, commercial grade DC motors for the most powerful suction and navigation ever in a robot.
Famous for a high ratio of torque to inertia, the DC motor can provide up to five time it's rated torque without stalling. The Sigma Dolphin pool cleaner utilizes not one, not two, but three onboad DC motors. The revolutionary 24 volt DC motors require 87% less energy than the AC motors that power old fashioned pool cleaners. Efficiency demands power. That was the principle then. And it still stands today. There was an opportunity to get more from less. To optimize the work input to work output. Enter the era of gyroscope enabled robotic pool cleaners.
Learn more at SigmaRobots.comIn a radical departure from ordinary cleaners, the Sigma pool cleaner was designed to clean all pool surfaces including the tile and waterline with pinpoint precision. For the first time ever, a consumer robot is equipped with an advanced Gyroscope to deliver precise control and positioning of the robot. While other cleaners fall from the wall, the all-new gyroscope and triple 3,000 RPM DC motor allows Sigma to remain firmly planted against the wall all the way to the top. Sigma Dolphin pool cleaners reaches every square inch of the pool as high speed spinning brushes handle difficult colonies of bacteria, algae, and biofilm. Sigma reaches deep inside pool corners, scrubs, and vacuums so you don't have to.
Yet again, everything comes back into play. It’s about a new benchmark. We are always looking forward. Not sideways, never back. We started from scratch. And we gave everything we got to make the newest Dolphin even better. Our goal was simple. To create the next Dolphin that can do more, deliver more and consume less power than ever before. The Sigma represents the future of the Dolphin brand. A fascinating future that shows what’s possible. Its design is completely new, but like that of every Dolphin that came before, it’s based on years of research and engineering. The all-new Sigma takes its place at the top of the Dolphin line and in the top echelon of its class.
There are few pool cleaners that are capable of cleaning your pool in a truly satisfying way. It started with a vision. A vision to completely reimagine what we expect from a robotic pool cleaner. Traditional cleaners have no brushes that contact the pool surface. We gave Sigma not one, not two, but four powerful brushes. Engineers gave Sigma dual spinning brushes that power scrub the pool surface and a third center CleanSweep™ brush that rapidly oscillates back and forth to dislodge stubborn contaminants. Together, the triple brush systems provides exceptional agitation and brushing performance.
In addition to vacuuming loose debris, the new Sigma really shines when it comes to difficult to remove contaminants like algae, bacteria, and biofilm that’s firmly attached to the wall of most pools. There are 21,000 known varieties of algae. Chances are, you’ve dealt with at least a few of them. Resistant to chlorine, biofilm is self-perpetuating and very difficult to remove. Traditional pool cleaners only pick up loose contaminants, leaving stubborn contaminants stuck to the pool wall. But the Sigma attacks stubborn contaminants at their core, thanks to its Dual NanoFilters™. Biofilms in swimming pools can and often do lead to cloudy water, algae blooms, scale build-up, and even corrosion.
Try any robot in your pool risk-free for 30 days. We believe a pool robot is an investment, and we know you'll love it. Which is why we have a 30 Day Free Trial. If you don't love it, simply return the robot. Unlike the other guys, we never charge a restocking fee or any other fees - meaning no restocking fee ever.
Here at Poolbots, we carry only the top models for the top brands. All of our pool robots are backed by a full manufacturer's warranty - not prorated or limited to cycles like other pool robots.
Easily transport your Dolphin Sigma with the Dolphin Universal Caddy. Fits any Dolphin Robotic Pool Cleaner.
| Waterline Cleaning | Yes |
|---|---|
| Wall Climbing | Yes |
| Dual Stabilizer | Yes |
| Number of Motors | 3 |
| Gallons Filtered Per Hour | 4500 GPH |
| Filter Types | Ultra-fine NanoFilters and Standard Filter Cartridge sets |
| Pool Coverage | Floor, Walls, Waterline |
| Pool Types | In Ground |
| Pool Size | 50 ft |
| Pool Shapes | Rectangle, Oval, or Freeform |
| Pool Surfaces | Concrete, Plaster, Gunite, Pebble, Tile, Vinyl Liner, Fiberglass |
| Cable Length | 60 ft |
| Anti-Tangle Swivel | Yes |
| Obstacle Avoidance | Steps, Ladder, Drain Cover, Ledges, Pop-Ups |
| Warranty | 3 Years |
| Brand | Dolphin |
| Manufacturer | Maytronics |
| Part Number | 99991036-SPLI |
| ASIN | B07CZ1XVZX |
| Microsite | Visit Microsite |
Real reviews from verified customers on Google.
John Rodriguez of "Poolbots" recommended the Dolphin Sigma for my 20x40 Saltwater pool. I have to say, "John was correct...this thing is a beast!" I live in the SoCal desert and the Sigma picks up the fine dirt, sand and phosphate residue. John answered all of my questions. Shipping was quick! Semper Fi — USMC 1984-1992
"Patient, knowledgeable, and took the time to answer all of my questions thoroughly."
Jose provided clear and detailed information about the pool cleaners. His professionalism made the whole process stress-free.
I wish I would have converted my pressure side vac to an electric pool robot a long time ago. It cleans 10x better and completes my pool in 90 minutes.
"Without her multiple emails to the company, this would never have happened."
Shannon assisted me with an ongoing issue since May 2025 with a manufacturer. She went the extra mile and followed up!
Excellent customer service and super fast shipping. I highly recommend Poolbots for all your needs.
"I asked to speak to a human — and was told 'I am a human!'"
I clicked "chat" expecting AI. I was so pleased this company still has human interaction. John was great.
I really appreciate the opportunity to try a robot and be able to swap it. Great return process and customer service.
"A far better and more informed purchase option than Amazon."
John went out of his way to go over all the different units and what might be best for my pool. Absolutely awesome customer service.
"Truly treats you like family."
I had a few issues with my product, but Jose did an amazing job helping me and stayed in constant communication throughout the entire process.
"Jose helped fix my incorrect shipping address... saved me a lot of grief."
His help was excellent. Quick intervention prevented a lost shipment.
"Because of John, I bookmarked Poolbots and will use them for everything."
He was very knowledgeable, professional, and interested in getting you the right product — not just making a sale.
"John was amazing. I had no idea what I needed."
He was very patient. After giving me multiple options and explaining the differences, he offered the perfect unit for my pool.
"Call John, you won't be sorry!"
John guided me through the process of selecting the best pool cleaner robot for my needs. Very highly recommend!
"John was correct...this thing is a beast!" Picks up the fine dirt, sand and phosphate residue in the SoCal desert. Semper Fi — USMC 1984-1992
I wish I would have converted my pressure side vac to an electric pool robot a long time ago. It cleans 10x better and completes my pool in 90 minutes.
Excellent customer service and super fast shipping. I highly recommend Poolbots for all your needs.
I really appreciate the opportunity to try a robot and be able to swap it. Great return process and customer service.
I have the sigma (previously owned s300i) cleans great better than my old one. Was getting stuck on drains I called factory. I had to ship it to them (they paid for the return) the added a middle brush fixed the problem Shipping wasnt cheap but it was worth it
We have been unground pool owners for years so when I found this pool cleaner I was hopeful. This is the BEST pool cleaner we have ever had. So easy to use. There pool is so clean! You don't need to attach to the pool filter in any way. We just drop it in the pool and push start. I would highly recommend this cleaner. It's worth every penny
ROBERT WAS VERY HELPFUL IN IN THE SELL OF THIS PRODUCT
Bought this last season, and am extremely impressed. Came from a Tigershark, which did an OK job, but would get stuck too often in my pool. The Sigma has yet to get stuck once all last season and after about 10 uses this season. Powerful pumps, ripples the top of the water from 10 feet deep. Quick cleaning. Bluetooth is hard to use for spot cleaning, I just don't bother with it. It cleans my 20x40 foot pool in about 2.5 hours, no need to spot clean after. If it lasts another 2 seasons, I will consider it one of my best purchases for pool cleaning. Have not felt the need to manually vaccuum since I bought it. Highly recommend.
Great. Does not get hung up... Does a great job.
No, we never charge a restocking fee ever! We know a robotic pool cleaner is a big investment, which is why we offer Free 30-Day Trials on all robotic pool cleaners!
As a proud Authorized Dealer for Dolphin, the Dolphin Sigma includes a full 3 year warranty from date of purchase.
No! The Dolphin Sigma is plug and play! All you need to do is unbox the unit and plug it into an outlet. No setup or assembly required!
With a main drain clip on, you can successfully avoid the robot getting stuck on your drain.
Yes. The Dolphin Sigma works with all types of pools, including freshwater and saltwater.
The Dolphin Sigma is compatible with the following types of pools: In-ground pools, above-ground pools, gunite pools, tile pools, fiberglass pools, and vinyl pools of all shapes and sizes.
If you have any questions or wonder if this is the right robot for you, contact us or view our Pool Robot Guide.
Yes, the Dolphin Sigma has wifi and bluetooth that allows you to connect and control the robot from the app.
Yes, the Dolphin Sigma has an app to control the robot.
The Dolphin Sigma cleans for 2.5 hours. You can set the robot to run daily via its included programmable timer.
The Dolphin Sigma weighs 24.63 lb.
The Dolphin Sigma works as an automatic robotic pool cleaner. It will vacuum, scrub, and automate your pool cleaning. With a plug and play design, all you need is an outlet to plug it into and you're good to go. No booster pump or assembly needed.
The Dolphin Sigma is great at cleaning and picking up leaves. With a larger filter and strong flowrate, the Sigma can vacuum leaves with ease.
Yes! With the Dolphin Sigma's included NanoFilters, the Sigma is ready to vacuum and clean small debris and algae right out of the box. Simply swap the included NanoFilters into the robot and start cleaning!
The Dolphin Sigma includes NanoFilters in the box.
Yes, the Dolphin Sigma cleans the waterline.
Yes, the Dolphin Sigma cleans your entire pool - including the floor, walls, and waterline.
Yes it can!
If your Dolphin powers on but does not move, try checking the tracks for any debris or obstructions. Also, check the drive motor and impeller for any damage or wear. If you are still having issues, contact Maytronics customer support for further assistance.
If your Dolphin's power supply is not turning on, check to make sure it is properly plugged in and that the outlet it is plugged into is working. If the power supply is still not turning on, contact Maytronics customer support for further assistance.
If your Dolphin Sigma is not cleaning the pool properly, try checking the filter bag for any debris or blockages. Also, check the brushes and tracks for any damage or wear. If you are still having issues, contact Maytronics customer support for further assistance.
The handles on your Dolphin are for lifting and carrying the unit, while the floats are designed to help your Dolphin navigate around the pool and maintain proper buoyancy.
To remove any debris or obstructions from your Dolphin's tracks, turn off the power supply and carefully remove the tracks from the unit. Use a soft brush or cloth to clean the tracks and remove any debris. Once clean, reattach the tracks to the unit.
If the power unit LED indication is off even when the charger is connected, please try the following steps: 1) Unplug the power supply from the outlet and wait for 10 seconds. 2) Plug the power supply back in and check if the LED indication turns on. 3) If the LED indication still does not turn on, contact Maytronics customer support for further assistance.
Registering your Dolphin robotic pool cleaner allows you to receive important product updates and notifications, as well as access to exclusive content and promotions.
Still have questions? Contact our pool experts or call (888) 615-5728
Learn more about Nanofilters™, MaxBin™, and so much more to find which pool robot is right for you. Use our Pool Robot Selector to enter your pool type and find an exact match for your swimming pool's needs or read the Best Dolphin Pool Cleaner for 2026.
