Dolphin UltraFilters Cartridge Conversion Kit (9991412-R1)
- Genuine Maytronics Bag-to-Cartridge Conversion Kit (Part #9991412-R1)
- Includes BOTH the bottom mounting base AND 4 pleated UltraFilter panels
- Ditch messy inside-out cloth filter bags for fast garden-hose rinsing
- Fits Nautilus Pool Up, Supreme M3, Endeavor, Primal, Atlantis, DX3S/DX4S & more
- Captures microscopic silt, pollen & algae far finer than standard cloth bags
or 4 interest-free payments of $24.75 with
*Rates from 0% APR. Subject to eligibility check. See payment terms.
Stop Turning Slimy Filter Bags Inside Out—Upgrade to Cartridges
Complete Base + 4-Filter Kit
Includes the genuine Maytronics snap-in cartridge holder base PLUS 4 pleated UltraFilter panels.
Ditch Messy Cloth Bags
Replace awkward clip-on fabric bags with rigid pleated panels that spray clean in 30 seconds.
Ultra-Fine Silt & Pollen Trap
Pleated micropore material polishes hazy water and captures fine dust and algae.
Fits 11+ Classic Dolphins
Engineered for Nautilus Pool Up, Supreme M3, Endeavor, Apollo, Primal, DX3S, DX4S, Neptune/Plus, Atlantis & H50.
Maintains Full Suction
OEM flow geometry preserves strong wall climbing and suction.
Maytronics Certified OEM
Factory part #9991412-R1 locks directly into your cleaner's bottom bay.
Modernize Your Classic Dolphin in 60 Seconds
The genuine Maytronics UltraFilters Kit (9991412-R1) converts bottom-bag Dolphin cleaners into modern pleated-cartridge machines—shipping complete with the mounting frame assembly and 4 ultra-fine pleated panels.
Confirmed Compatible Dolphin Models
- Dolphin Nautilus Pool Up, Supreme M3 & Endeavor
- Dolphin Primal, Apollo, Atlantis & H50
- Dolphin DX3S, DX4S, Neptune & Neptune Plus
Dolphin UltraFilters Kit Specs
Dolphin UltraFilters Kit FAQ
Does this kit include the plastic frame/base needed to switch from a bag?
Yes! Both the bottom cartridge frame base and all 4 UltraFilter panels are included in part #9991412-R1.
Will this fit the Nautilus CC Plus?
No—the Nautilus CC Plus uses top-loading cartridges; order the Replacement Filter Assembly (9991428-ASSY) for the Nautilus CC Plus.
We’re Here Long After Delivery Day
Genuine Maytronics OEM Part
Manufacturer-backed protection and help from authorized US service centers.
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?
*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.