versus Dolphin Sigma®

Compare Features, Filters, and Warranty

Dolphin Sigma


Dolphin Sigma® Robotic Cleaner

Save $400
Save $400
Save up to $300 more with Open Box or Certified Refurbished

yes includes

yes Sigma® includes

Cleans floor (no wall or tile / waterline coverage)Ultimate Coverage - Full floor, wall, and waterline coverage
Includes Filter Options - Ultra-Fine and Standard Filter Includes Filter Options - Ultra-Fine and Standard Filter Sets
Year Warranty Backed by best-in-class 3 year warranty
Programmable Weekly Timer - Schedule cleanings every 24, 48, 72 hrs
Anti-Tangle Swivel - Patented 360 Degree Rotation
myDolphin Plus Smartphone App
Advanced Scheduling Options - Program Sigma to run on specific days and times every week.
Gyroscopic Sensors - Groundbreaking technology allows Sigma to clean better than ever before

yes does not include

yes Sigma® does not include

No Remote Control Capability


Waterline Cleaning yes  
myDolphin Plus App yes  
Gyroscope yes  
Standard Filter yes  
Ultra-Fine Filters
($79.99 Value)
Programmable Timer yes  
Dual Stabilizer yes  
Cable Swivel yes  
3 Year Warranty yes  

Dolphin Sigma®

Waterline Cleaning yes  
myDolphin Plus App yes  
Gyroscope yes  
Standard Filter yes  
Ultra-Fine Filters
($79.99 Value)
Programmable Timer yes  
Dual Stabilizer yes  
Cable Swivel yes  
3 Year Warranty yes  

Head To Head Review Analysis

Cleaning Performance

Both, the Dolphin Sigma and Dolphin Proteus DX5i clean your entire pool, including the pool's floor, walls, and waterline - scrubbing every inch of your pool, so you don't have to. This part of the swimming pool is vulnerable to dirt, grime, and algae buildup and accumulate. While other cleaners fall from the wall, waterline cleaning allows the robot to stay firmly planted against the wall all the way to the top. If your robot doesn't reach and clean the scum line, you'll still need to manually brush the pool afterwards each clean.

For the first time ever, the Dolphin Sigma's Dual Control Stabilizers and advanced microprocessor enable precise control and positioning of the robot. Thanks to these triple commercial grade motors, gyroscope, and dual stabilizer, the Dolphin Sigma cleans with more precision and power than previous generations of pool cleaners. The dual stabilizer acts as a counterbalance so the Sigma can effectively cling to the pool walls and waterline and even doubles as a handle. This allows Sigma to clean your pool floor, walls, and waterline (also called the scum line).

Dolphin Sigma Climbing Rocks
Dolphin Sigma's Powerful Waterline Cleaning

The Dolphin Proteus DX5i also covers your entire pool, including the pool floor, walls, and waterline.

Filter Options

Filters are one of the most important parts of a pool cleaner. A true robotic pool cleaner doesn't just vacuum, but scrubs away and filters out microscopic particles in your water. Dolphin's ultra-fine filter captures what the standard fine filter can't, such as sand and microscopic algae, while still picking up leaves, twigs, and even small bugs.

Dolphin Sigma Fine Filter
Dolphin Sigma's Cartridge Filter

Breaking down each of their filter options, the Dolphin Sigma® includes 2 filter sets: ultra-fine Filter Cartridges and the standard filters. The Dolphin Proteus DX5i includes only one filter option, the standard filter, but won't include the ultra-fine Filter. The ultra-fine Filter helps filter your pool water and removes small, microscopic algae, debris, and bacteria from your pool. The Proteus DX5i comes with one filter option included. While, the Dolphin Sigma® includes 2 Filter Cartridge Sets: ultra-fine and Standard. This gives you the ability to swap filters based on your pool's needs. If you need to clean up regular debris and leaves, you can use the fine filter cartridge. If your pool has lots of sand, algae, or even cloudy pool water, use the ultra-fine cartridges to filter and clean your pool.

Dolphin Sigma UltraFine and Fine Filter
Sigma includes both the fine and ultra-fine filter set

The Dolphin Sigma includes:

  • Standard Cartridge Filter Set
  • ultra-fine Cartridge Filter Set

The Dolphin Proteus DX5i includes:

  • Standard Cartridge Filter

Ease of Use

Both robots are super simple to set up and use. To get started, simply plug the power supply into an outdoor outlet, plug the unit into the power supply, drop the unit into the water, and press start. Both robots have a weekly timer with options for daily, every other day, and every three-day cycles. The Dolphin Sigma is controlled via the myDolphin Plus App, while the Proteus DX5i can be programmed via the power supply. Only the Sigma has the ability for Advanced Scheduling, which allows the robot to be set to run on specific days and times every week. So, if you want to clean Monday at 5pm and Saturday at 10am, it is as easy as the touch of a button – giving you the true automatic pool cleaner experience.

myDolphin Plus App

Both robots utilize the myDolphin Plus App, which is available on both Apple and Android devices. Both robots are controlled via Wi-Fi (or can set to Bluetooth if Wi-Fi isn’t avaliable where your pool is).

Anti-Tangle Swivel

Both robots come with an anti-tangle swivel to minimize cord tangling. You won’t have to worry about the cord tangling, as the robots will clean with power and precision in your swimming pool. The Patented Tangle Free Swivel from Maytronics allows the robot to rotate 360 degrees without your cord getting tangled.


A Warranty is one of the most important aspects of a pool robot. With Maytronics manufacturer warranty, the Dolphin Sigma and Dolphin Proteus DX5i are both fully covered. Maytronics' limited warranty isn't pro-rated or limited to hours/cycles. The Dolphin Sigma has a 50% longer warranty compared to the Proteus DX5i. The Dolphin Sigma includes a 3-year best-in-class warranty, while the Dolphin Proteus DX5i only has a 2 year warranty.The Sigma® offers a longer warranty: 36 months (3 years) compared to the Proteus DX5i' 24 month warranty (2 years). The Dolphin Sigma provides 12 more months of coverage when compared to the Dolphin Proteus DX5i

Which is the better pool robot?

When comparing the Sigma to the Dolphin Proteus DX5i, the Dolphin Sigma has triple commercial-grade motors, a gyroscope, a Dual Stabilizer, ultra-fine filter set, and a 50% longer warranty when compared to the Dolphin Proteus DX5i. If you want an automatic pool robot that does it all, the Dolphin Sigma may be for you.


Dolphin Sigma

Part Number 99991036-SPLI
Waterline Cleaning Yes
# of Filters Included: 2
Filter Cleaning Ultra-fine and Standard Filter Cartridge sets
Cleaning Coverage Floor, Walls, Waterline
Cleaning Cycle hours 2.5 hours
Number of Brushes 4
Cable Length 60 ft
Anti-Tangle Swivel Yes
Pool Types In Ground
Maximum Pool Size 50 ft
Pool Shape Rectangle, Oval, or Freeform
Obstacles Steps, Ladder, Drain Cover, Ledges, Pop-Ups
Surface Concrete, Plaster, Gunite, Pebble, Tile, Vinyl Liner, Fiberglass
Media-Alert® Yes
Automated Weekly Timer Yes
Remote operation Yes - Through App
Restocking Fee
Warranty Years 3 Years
MSRP $ $1897


Try Sigma in Your Pool for 30 days risk-free

Every pool deserves an intelligent robot. Take Sigma home and try in your own pool for 30 days.