Part of the Dolphin ProLine™ lineup · compare all 3 models
Dolphin Sigma Robotic Pool Cleaner — Certified Refurbished
- Save up to $530 off retail — Excellent, Good & Fair cosmetic grades
- Full 3-year warranty starting on delivery day + Maytronics-software tested
- Triple 24V commercial motors + onboard gyroscope + SmartNav 3.0™
- Includes dual top-load SnapLoc™ baskets + NanoFilter™ & mesh panels
- myDolphin™ Plus Wi-Fi app & 60-ft 360° anti-tangle swivel cable
or as low as $191.58/mo with
Make storage easier:
Dolphin Universal Caddy
$145
Why pool owners add the Universal Caddy
- Effortless Roll-to-Pool Transport – Wheel your Dolphin smoothly from patio or garage to poolside without heavy lifting
- Protects Scrubbing Brushes – Cradles the cleaner off the ground so active brushes never develop flat spots in storage
- Integrated Power Supply Mount – Locks your power supply upright off wet decks and neatly coils up to 60 ft of swivel cable
- Genuine Maytronics Fit – Engineered specifically by Maytronics to cradle residential Dolphin robotic pool cleaners
Dolphin Premium Caddy Cover
$99
Why add the Premium Caddy Cover
- All-Season UV & Rain Shield – Heavy-duty woven polyester protects plastics, tracks, and cables from harsh sun and storms
- Shields Power Supply Electronics – Keeps your caddy-mounted power supply dry, shaded, and free of dust and pollen
- Ventilated, Wind-Secure Fit – Built-in side vents prevent trapped humidity while bottom velcro straps hold firm in high winds
- Roll Without Removing – Integrated top handle slot lets you wheel your covered caddy straight into storage
*Rates from 0% APR. Subject to eligibility check. See payment terms.
Own Dolphin's $2,399 Triple-Motor Flagship for Hundreds Less
Certified by Maytronics Software
Every motor, gyroscope sensor, track, seal, swivel, and Wi-Fi power supply is tested to factory spec.
Full 3-Year Warranty
Carries the exact same 3-year warranty length as a brand-new Sigma—starting on your delivery date.
Choose Your Cosmetic Savings
Select Excellent, Good, or Fair exterior finish; every tier delivers identical 4,500 GPH cleaning performance.
Triple Commercial DC Motors
Unmatched climbing grip and split-quad-brush corner agility for complex inground pools up to 50+ ft.
Dual SnapLoc™ NanoFilters™
Top-load cartridges unclip in seconds and ship with both 2-micron pleated and standard mesh panels.
Wi-Fi App + Weekly Scheduler
Control and schedule cleanings from anywhere with the myDolphin™ Plus smartphone app.
The Tech Flagship of the Dolphin Lineup
Engineered for pool owners who want commercial-grade hardware with smartphone convenience, the Dolphin Sigma combines three brushless DC motors, an onboard gyroscope, Dual-Quad split scrubbing brushes, and myDolphin™ Plus Wi-Fi control in one flagship machine.
High-Capacity SnapLoc™ NanoFilter™ Cartridges
Forget messy filter bags or cramped single trays. The Sigma uses oversized top-access SnapLoc™ filter panels that unclip individually so trapped leaves, sand, pollen, and fine silt rinse clean with a garden hose in seconds. Both ultra-fine NanoFilter™ pleated panels and standard mesh panels come in the box.
PowerClean™ Split Quad Scrubbing Brushes
Four independent brush segments counter-rotate across the front and rear of the chassis, giving the Sigma tank-like pivot precision in tight corners, curves, and steps while aggressively scrubbing away stubborn algae and surface biofilm.
Precision Wall & Waterline Grip
Guided by its onboard gyroscope and high-torque HyperGrip™ tracks, the Sigma climbs vertical walls and scrubs laterally along your tile line—removing sunscreen rings and waterline buildup before they stain.
Triple Commercial-Grade 24V DC Motors
Most residential robots share one drive motor and one pump motor. The Sigma steps up to three dedicated 24-volt DC motors—delivering 4,500 GPH suction and zero-radius turning while using nearly 90% less electricity than legacy pressure-side cleaners.
Gyroscope + SmartNav 3.0™ Navigation
Complex freeform pools, deep hoppers, and island steps confuse basic timers. Sigma's internal gyroscope continuously corrects heading drift while SmartNav 3.0™ maps your floor and walls for systematic 2.5-hour full-pool coverage.
myDolphin™ Plus Wi-Fi App & Weekly Timer
Start a cycle from work, program recurring weekly cleanings, switch cleaning modes, or check cycle progress right from your iPhone or Android device—all backed by a 60-foot anti-tangle swivel cable and Maytronics' 3-year ProLine™ warranty.
Independent Hands-On Reviews
Cosmetic Scuffs Outside—100% Certified Flagship Inside
Each Certified Refurbished Dolphin Sigma is bench-tested with official Maytronics diagnostics, fitted with clean SnapLoc™ NanoFilter™ and mesh cartridge sets, and backed by a full 3-year warranty plus 30-day returns:
- Excellent Grade: Minimal cosmetic signs of prior handling; near-new look.
- Good Grade: Light exterior scuffs on housing or tracks; 100% mechanical and Wi-Fi certification.
- Fair Grade: Visible cosmetic scratches on the body—huge $500+ savings with the exact same triple-motor power and 3-year warranty.
Dolphin Sigma (Refurbished) Specs
Dolphin Sigma (Refurbished) FAQ
Does Fair grade have a shorter warranty than Excellent grade?
No! Every cosmetic grade (Excellent, Good, and Fair) includes the exact same 3-year warranty starting on delivery day.
Are all accessories and filter sets included?
Yes—you receive the Sigma robot with 60-ft swivel cord, Wi-Fi smart power supply, dual SnapLoc™ baskets, 4 NanoFilter™ panels, and 4 standard mesh panels.
Can I return a refurbished Sigma if needed?
Yes, our 30-day return policy applies to eligible Certified Refurbished cleaners.
We’re Here Long After Delivery Day
3-Year Warranty (Starts on Delivery)
Diagnostic-certified across all three motors, gyroscope, and Wi-Fi supply, backed by a full 3-year warranty from delivery. See warranty details.
30-Day Returns
If it isn’t right for your pool, start a return within 30 days.
Fast, Free Shipping
Your cleaner ships fast and free on qualifying orders, ready for its first run.
Let the robot clean the pool. Let ICO watch the water.
ICO tests your water every hour and tells you exactly what to add—before cloudy water or algae ruins the weekend.
- Measures pH, ORP, and water temperature every hour
- Exact chemical amounts in the free iOS & Android app
- Warns you before heat or rain knocks the water out of balance
- Versions for chlorine/bromine and salt water pools (salt also tracks TDS)
ICO - The Smart Pool Water Monitor
Hourly water readings and exact dosing help—without another subscription.
Which type of pool do you have?
Complete Your Setup
Make poolside transport effortless and shield your cleaner and power supply between cycles.
How the Dolphin Sigma (Refurbished) Stacks Up
See what spending more—or less—changes in pool size, filtration, warranty, and everyday convenience.
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|---|---|---|---|---|---|
| Best for | Tech-lovers who want it all | Premium clean without the UV price | Cleaner, sanitised water | Heavy leaves & debris | Tech-lovers who want it all |
| Cleaning coverage | Floor, walls & waterline | Floor, walls & waterline | Floor, walls & waterline | Floor, walls & waterline | Floor, walls & waterline |
| Filtration | Dual top-load cartridges + NanoFilters™ | UltraFilter™ (1μm / 180μm) | UltraFilter™ (1μm / 180μm) | Multi-Media™ (4 media + leaf bag) + NanoFilters™ | Dual top-load cartridges + NanoFilters™ |
| Warranty | 3 years | 3 years | 3 years | 3 years | 3 years |
| Climbs walls | |||||
| Scrubs waterline | |||||
| Ultra-fine filtration | |||||
| Wi-Fi + app control | — | ||||
| UV water clarifier | — | — | — | — |
Specs are based on manufacturer data; prices can change. Build your own comparison →
*Rates from 0% APR or 10–36% APR. Payment options through Shop Pay Installments are subject to an eligibility check and are provided by these lending partners: affirm.com/lenders. Options depend on your purchase amount, and a down payment may be required. State notices to consumers: affirm.com/licenses.