For pool owners seeking efficient and reliable water treatment solutions, our guide to the best UV filter for pools is a must-read. Uncover the top choices that are making waves in 2026.
Are you tired of cloudy pool water that just won't clear up no matter what you do? Perhaps it's time to upgrade your pool's cleaning system. Our selection of the best UV filter for pools will introduce you to some amazing choices. Let's dive in and uncover the options that can transform your pool experience into a clean, refreshing delight!
✅ Filters May Be Green or Blue ✅ REPLACEMENT FILTER - Get purer, cleaner water in your pool or spa with these replacement cartridge filters compatible for Unicel C-4325, C-4326, Filbur FC-2390, and Pleatco PRB50-IN and PRB68. See below for alternative filter names. Filters May Be Green or Blue✅ DIME
Key specs
- Cartridge dimensions
- The cartridge measures 13 5/16 inches in length with a 5-inch outside diameter and matching 2 1/8-inch open ports at both ends.
- Filtration surface area
- 25 sq ft
Pros:
- Trilobal spunbond fabric creates uniform pleats that catch fine particulates without early clogging
- Exact 2 1/8-inch top and bottom openings seat firmly over standard internal standpipes
- Direct replacement match for common OEM references including Pleatco PRB25-IN and Unicel C-4326
- Open core allows direct water flow through pleats for quick hose rinsing
Cons:
- Single-cartridge pack requires pool shutoff while rinsing the dirty element
- Cartridge end cap or pleat color may arrive as blue, green, or white depending on manufacturing batches
✅ Filters May Be Green or Blue ✅ REPLACEMENT FILTER - Get purer, cleaner water in your pool or spa with these replacement cartridge filters compatible for Unicel C-4325, C-4326, Filbur FC-2390, and Pleatco PRB50-IN and PRB68. See below for alternative filter names. Filters May Be Green or Blue✅ DIME
Key specs
- Cartridge dimensions
- Measures 13 5/16 inches long by 5 inches wide, with identical 2 1/8-inch openings on top and bottom.
- Maintenance cycle
- Rotating two cartridges lets you clean one thoroughly while the active filter keeps pool water circulating without interruption.
Pros:
- Two-pack bundle allows swapping a clean cartridge into the canister immediately to avoid downtime
- Spunbond trilobal media traps fine sediment while holding shape under flow pressure
- Open 2 1/8-inch top and bottom holes ensure compatibility with PRB25-IN canister fittings
- Durable pleat material releases trapped dirt quickly during standard hose washing
Cons:
- Requires verifying canister depth to ensure the 13 5/16-inch length allows a watertight seal
- Fabric color varies between green, blue, and white across production runs
✅ Filters May Be Green or Blue ✅ REPLACEMENT FILTER - Get purer, cleaner water in your pool or spa with these replacement cartridge filters compatible for Pleatco PRB50IN, Unicel C-4950, Filbur FC-2390. Filters May Be Green or Blue✅ DIMENSIONS - This replacement pool filter cartridge has an open 2 1
Key specs
- Core openings
- 2 1/8-inch open top and bottom
- Cross-reference compatibility
- Pleatco: PRB50IN
- Unicel: C-4950
- Filbur: FC-2390
Pros:
- Direct replacement fit for Pleatco PRB50IN, Unicel C-4950, and Filbur FC-2390 canisters
- Two-pack set eliminates pump downtime during deep cleaning sessions
- Spunbond trilobal pleats resist flattening to maintain steady circulation pressure
- Dual 2 1/8-inch open ports slide directly onto standard canister cores without adapters
Cons:
- Outer diameter ranges between 4 15/16 and 5 inches, requiring a check of canister clearance
- Media color ships randomly in white, blue, or green based on factory availability
4 pack type A or C 29000E/59900E filters, compatible with INTEX cartridge filter pump models: 603,604/G,637R,638R/G,635T,636T/GAlso compatible with Summer Waves canisters: RX & SFX 1000, RX & SFX 1500, RP & SFS 700/800, RP & SFS 1000, RP & SFS 1500, RP & SFS 2000 (2013 & newer), CP2000-C; compares t
Key specs
- Pump compatibility
- Intex pumps: 603, 604/G, 637R, 638R/G, 635T, 636T/G
- Summer Waves: RX and SFX 1000/1500 canisters
- Summer Waves: RP and SFS 700, 800, 1000, 1500, 2000, CP2000-C
- Replacement frequency
- Every 2 weeks
Pros:
- Four-pack setup covers multiple bi-weekly replacement cycles for seasonal above ground pools
- Matches Type A and Type C canister fittings across Intex and Summer Waves pump systems
- Dacron filter fabric collects fine debris, dead algae, and sediment to reduce water haze
- Compact 8-inch length slips directly into above ground skimmer filter housings
Cons:
- Dacron material requires replacement every two weeks according to manufacturer instructions
- Designed only for small above ground filter pumps and cannot handle high-pressure inground canisters
- Lacks the higher particulate-holding surface of larger trilobal cartridges
SPA FILTER SPECIFICATIONS:Length:10 1/2",outside diameter:6",top:1 15/16" open,bottom:1 15/16"open.PLACEMENT MODELS:Watkins 31489 aquaterra spa filter compatible with PWK30,Unicel C-6430,Unicel C-6430RA,PLE-051-9186,PLE-051-9670,71825,73178,73250,75401,13004,46200,4900-173,Balene AK-5005,APCC7095,AP
Key specs
- Filtration surface area
- 30 sq ft per cartridge
- Port dimensions
- Features 1 15/16-inch open top and bottom holes with a 10 1/2-inch length and 6-inch outside diameter.
Pros:
- Trilobal fiber structure delivers 21 to 40 percent higher dirt-holding capacity than point-bond fabric
- Generous 30 square foot surface area traps fine silt without causing premature pressure spikes
- Direct cross-reference match for Watkins 31489, Unicel C-6430, and Hot Spring setups
- Three-pack supply ensures spare cartridges are always clean and ready for fast rotation
Cons:
- Opening size is 1 15/16 inches, which will not fit canisters requiring 2 1/8-inch ports
- Manufacturer advises bi-weekly hose cleanings to prevent heavy buildup between pleats
Powerful Filtration Performance: The unique trilobal fabric captures much more contaminants than regular fabric, which can efficiently removes hair, leaves, dust, sediment, sand, etc.Replacement Models: Pentair CCP520 R173578 Unicel C-7472 Filbur FC-1978 FC-6475|160332 178585| Clean and Clear Plus 5
Key specs
- Cross-reference compatibility
- Pentair: Clean and Clear Plus 520, CCP520, R173578
- Unicel: C-7472
- Filbur: FC-1978, FC-6475
- OEM part numbers: 160332, 178585
- Core openings
- 3-inch open top and bottom
Pros:
- Four-pack provides a full replacement set for multi-cartridge Pentair Clean and Clear Plus 520 systems
- Engineered free-flow core maintains strong water circulation across tall 32 1/16-inch cartridges
- Trilobal fabric effectively collects fine hair, leaves, sand, and cloud-causing silt
- Standard 3-inch open ends seat smoothly on large-scale manifold distributors
Cons:
- Large 32 1/16-inch height makes thorough wash-downs more time-consuming than with small filters
- Only fits high-capacity commercial and inground canisters built for 7-inch diameter cartridges
Last update on 2026-09-18 / Affiliate links / Images, Product Titles, and Product Highlights from Amazon Product Advertising API
How do I confirm if a replacement cartridge fits my pool filter canister?
Match the cross-reference part numbers and physical dimensions against your existing cartridge before purchasing. Check the manufacturer stamp on your old end caps for standard part numbers like Unicel C-4326, Filbur FC-2375, or Pleatco PRB25-IN, or compare your canister system directly, such as verifying Pentair Clean and Clear Plus 520 compatibility against numbers like R173578 or C-7472. If cross-reference numbers have worn off, verify the exact length, outside diameter, and hole openings against your housing specifications. Pairing an exact fit with equipment like a robotic pool cleaner for canister filter setups helps keep coarse debris from overwhelming your cartridge.
How do I measure cartridge diameter and hole openings correctly?
Measure the outside diameter across the widest part of the end cap, the overall length from end to end, and the interior width of the top and bottom openings. For example, some common pool and spa cartridges feature a 5-inch diameter with 2 1/8-inch top and bottom open holes and a 13 5/16-inch length, while others require a 6-inch outside diameter with 1 15/16-inch openings and a 10 1/2-inch length. Even a slight variation can prevent the cartridge from seating properly over your canister manifold. Always confirm whether your canister requires open holes on both ends or a closed top before ordering.
What fabric type helps clear fine particles and cloudy pool water?
Trilobal pleated fabric provides enhanced particle capture to trap fine contaminants before they bypass the filter core. Cartridges made with trilobal material are designed to collect sediment, dust, sand, hair, and leaves more effectively than standard flat fabrics. Capturing these fine particles prevents suspended sediment from recirculating back into your pool, which helps restore water clarity without placing unnecessary strain on your pump.
Which pool pump canisters use Type A or C filter cartridges?
Type A or C cartridges fit select small above-ground filtration systems, including INTEX cartridge filter pump models 603, 604/G, 637R, 638R/G, 635T, and 636T/G. They also match Summer Waves canisters such as the RX and SFX 1000, RX and SFX 1500, RP and SFS 700/800, RP and SFS 1000, RP and SFS 1500, RP and SFS 2000 for units built in 2013 and newer, as well as the CP2000-C. If you operate a larger above-ground or inground installation, check our guide on selecting a pool filter for 10000 gallon pool systems to match your gallon capacity.
Why does a loose-fitting cartridge cause cloudy water and high pump pressure?
A loose cartridge fails to create a tight mechanical seal against the canister ports, allowing untreated water to bypass the pleats entirely. When water slips around unsealed end caps, fine sediment and debris continuously recirculate into the swimming pool instead of remaining trapped in the fabric. At the same time, misaligned cartridges disrupt balanced flow across the core, creating uneven flow resistance that forces pump pressure to climb.
How often do pool filter cartridges need to be rinsed and replaced?
Rinse your filter pleats whenever water flow noticeably decreases or pressure builds inside the canister, and replace cartridges when the media shows visible wear. While cleaning frequency depends on pool size, bather load, and environmental debris, washing cartridges with a garden hose clears trapped sand, dirt, and sediment from between the folds. Inspect the end caps during every wash, and replace the unit if you notice cracked caps, collapsed pleats, or tears in the fabric that let unfiltered water pass through.
