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4 - 4.99 Inch Diameter Pool Filter Cartridges

We make it easy to find the right cartridge!

Choosing the right filter cartridge for your pool or spa filter can be rather confusing.  After all, we offer more than 500 different filter cartridges at POOLplaza.com. We have come up with several ways to find the right cartridge for your pool or spa filter. Once you have found the right cartridge, it's important to double check the dimensions and other specifications to make sure you have the right one.

If you have any questions, do not hesitate to e-mail us.  We answer every single email we receive from our customers.  We want to make sure that you get the right product in a timely manner.

Wondering about the quality of Unicel Replacement Cartridges?  We sell our customers Unicel replacement cartridges whenever possible because they are manufactured to the same high standards as the originals, but the cost is often far less.  

How do I choose the right cartridge?

Click on Unicel# below for more info or to purchase
Width Length

Top End Cap

Bottom End Cap Filter Brand/Model Unicel#
4-1/4" 4" 1-15/16" / open 1-15/16" / open 10 sq. ft. skim filter C-4310
4-1/4" 7-1/8" 2" / open semi-circular handle 15 sq.ft. Icon Spas C-4315
4-1/4" 8" 1-15/16" / open closed SLM, Buddy-L, Waterworks, Empire, Pelican Recreational, Haughs D-8 skim filter, H20 Recreation C-4304
4-1/4" 8" 1-3/4" / open 1-3/4" / open 5 sq. ft. General Foam Plastics C-4306
4-1/4" 8" 1-15/16" / open 1-15/16" / open Coleco F-120/DR-7, Krystal Klear Models 108R/12, Intex, Sand-n-Sun, Wet Set, Easy Set C-4607
4-1/4" 8" 1-15/16" / open 1-15/16" / open Coleco F-120 C-4606
4-1/4" 10-7/8" 1-15/16" / open 1-15/16" / open 9 sq. ft. Haugh's, Jacuzzi Leisure C-11 C-4603
4-1/4" 12" 2" / open semi-circular handle 25 sq.ft. Icon Spas C-4329
4-1/4" 17-7/8" 1-15/16" / open 1-15/16" / open 15 sq. ft. Haugh's, Jacuzzi Leisure C-22 C-4604
4-1/4" 23-3/4" 2" / open semi-circular handle 60 sq.ft. Icon Spas C-4360
4-1/4" 23-3/4" 2-5/16" / open w/ molded o-ring semi-circular handle 50 sq.ft. Icon Spas C-4351
4-5/16" 8" 2-3/16" / open closed 8 sq.ft. Muskin A2300 C-4600
4-5/16" 8" 2-3/16" / open 2-3/16" / open 8 sq.ft. Muskin FP A2027, Sears, Haugh Products C-4605
4-5/16" 8" 2-3/16" / open 2-3/16" / open Muskin C-4602
4-1/2" 9-3/4" 1-1/16" / open 1-1/16" / open Sta-Rite TX-15 C-4610
4-5/8" 4-5/8" 1-1/2” male thread/MPT molded cone handle 13 sq. ft. top load 4CH-19
4-5/8" 4-5/8" 1-9/10" / open molded cone handle 12 sq.ft. Pleatco skim filter, Softsider Spas, Comfort Line Spas C-4302
4-5/8" 6-3/4" 1-1/2” male thread/MPT molded cone handle 20 sq. ft. top load 4CH-20
4-5/8" 6-3/4" 1-9/10" / open molded cone handle 15 sq.ft. Pleatco skim filter, Softsider Spas, Vita Spas C-4303
4-5/8" 8" 1-1/2” male thread/MPT molded cone handle 19 sq. ft. top load 4CH-21
4-5/8" 9-3/4" 1-1/2” male thread/MPT molded cone handle 25 sq. ft. top load 4CH-24
4-5/8" 9-3/4" 1-7/8" / open w/ slots molded cone handle 20 sq. ft. Aqua Spa C-4402
4-5/8" 9-3/4" 1-9/10" / open molded cone handle 25 sq.ft. Pleatco skim filter, Spa Manufacturers, Gatsby Spas C-4324
4-5/8" 11-5/8" 1-3/8" / open molded cone handle 25 sq. ft. Nemco C-4403
4-5/8" 11-7/8" 1-1/2” male thread/MPT molded cone handle 30 sq. ft. top load 4CH-30
4-5/8" 11-7/8" 2-1/16" / open 2-1/16" / open 12 sq. ft. Hayward C120-RE C-4312
4-5/8" 11-7/8" 2-1/16" / open 2-1/16" / open 20 sq. ft. Hayward CX200-RE, American Commander II (in-line) C-4320
4-5/8" 11-7/8" 2-1/16" / open 2-1/16" / open 25 sq. ft. Hayward CX225-RE, American Commander II (in-line) C-4325
4-5/8" 11-7/8" 2-1/16" / open 2-1/16" / open 25 sq. ft. American Commander II (in-line) C-4327
4-5/8" 11-7/8" 2-1/16" / open 2-1/16" / open 20 sq. ft. American Commmander II (in-line) C-4620
4-5/8" 12" 1-1/2" SAE thread semi-circular handle 25 sq. ft. top load - Dimension One Spas 4CH-950
4-5/8" 14-3/4" 1-1/2” male thread/MPT molded cone handle 50 sq. ft. top load 4CH-50
4-5/8" 15" 1-1/2" SAE thread semi-circular handle 40 sq. ft. top load - Dimension One Spas 4CH-940
4-5/8" 16" 1-1/2” male thread/MPT molded cone handle 35 sq. ft. top load 4CH-35
4-5/8" 16-3/4" 2-1/16" / open castle 40 sq. ft. Sundance Spas C-4440
4-5/8" 19-5/8" 1-1/2” male thread/MPT molded cone handle 65 sq. ft. top load 4CH-65
4-5/8" 23-3/4" 2-1/16" / open 2-1/16" / open 50 sq. ft. Grecian Spa C-4350
4-3/4" 8" 2-3/8" / open 1-1/8" / open Coleco F-110, CR-8 C-4609
4-3/4" 8" 2-3/8" / open 1-1/8" / open Coleco F-110, CR-8, Cyclone Pool Vac C-4608
4-3/4" 8" 1-3/4" / open 1-3/4" / open 7 sq. ft. General Foam Plastics C-4307
4-3/4" 8" 1-3/4" / open 1-3/4" / open 10 sq. ft. General Foam Plastics C-4309
4-3/4" 11" 2-3/8" / open 1-1/8" / open Coleco F-112, F-350, CR-11, DR-11 C-4611
4-3/4" 16" 2-3/8" / open 1-1/8" / open Coleco F-750, F-775, F-850, F-875, DR-16 C-4616
4-3/4" 18" 2-3/8" / open 1-1/8" / open Coleco F-225, F-235, F-345, DR-18, Lomart 60-4314 C-4618
4-3/4" 18" 2-3/8" / open 1-1/8" / open 16 sq.ft. Lomart 60-4316 C-4601
4-15/16" 4-5/8" 2-1/8" / open 2-1/8" / open Rainbow DSF-35, Waterway Plastics C-4401
4-15/16" 5-1/2" 1-9/10" / open closed 16 sq.ft. Splash Tub C-4316
4-15/16" 6-5/8" 1-1/2” male thread/MPT closed 25 sq.ft. Freeflow Spas 4CH-23
4-15/16" 6-5/8" 1-1/2” male thread/MPT 2-1/8" / open 25 sq.ft. Freeflow Spas 4CH-22
4-15/16" 6-5/8" 2-1/8" / open 2-1/8" / open Rainbow DSF-50, Waterway Plastics C-4405
4-15/16" 9-1/4" 2-1/8" / open 2-1/8" / open 35 sq. ft. Rainbow, Waterway Plastics, Custom Molded Products C-4335
4-15/16" 9-13/16" closed 2-1/8" / open 25 sq. ft. Santanna C-4328
4-15/16" 9-13/16" 2-1/8" / open 2-1/8" / open 25 sq. ft. Santanna C-4428
4-15/16" 10-3/8" 2-1/8" / open closed 30 sq. ft. skim filter, Lifestyle C-4431
4-15/16" 10-3/8" 2-1/8" / open 2-1/8" / open 30 sq. ft. Nemco C-4429
4-15/16" 11-1/4" 2-1/8" / open 2-1/8" / open 40 sq. ft. Waterway Plastics C-4339
4-15/16" 11-5/8" 2-1/8" / open 2-1/8" / open 40 sq. ft. Dimension One Spas C-4340
4-15/16" 11-7/8" 2-1/8" / open 2-1/8" / open 30 sq. ft. Santanna C-4430
4-15/16" 11-7/8" 2-1/8" / open 2-1/8" / open 32 sq. ft. Martec, Sonfarrel, Advantage Mfg. C-4332
4-15/16" 12-1/4" 2-1/8" / open 2-1/8" / open 45 sq. ft. spa filter C-4311
4-15/16" 13-5/16" 2-1/8" / open closed w/ raised ring Rainbow Leaf Canister C-4321
4-15/16" 13-5/16" 2-1/8" / open 2-1/8" / open 25 sq. ft. Rainbow, Waterway Plastics, Custom Molded Products C-4326
4-15/16" 13-5/16" 2-1/8" / open 2-1/8" / open 25 sq. ft. Rainbow, Waterway Plastics, Custom Molded Products C-4625
4-15/16" 13-5/16" 2-1/8" / open 2-1/8" / open 37 sq. ft. Rainbow, Waterway Plastics, Morgan Spas, Leisure Bay Spas, Custom Molded Products C-4637
4-15/16" 13-5/16" 2-1/8" / open 2-1/8" / open 50 sq. ft. Rainbow, Waterway Plastics, Custom Molded Products C-4950
4-15/16" 14-9/16" 2-1/8" / open 2-1/8" / open 25 sq. ft. Sonfarrel C-4308
4-15/16" 14-7/8" 2-1/8" / open closed 45 sq. ft. Santanna C-4345
4-15/16" 14-7/8" 2-1/8" / open 2-1/8" / open 28 sq. ft. Martec, Sonfarrel C-4301
4-15/16" 14-7/8" 2-1/8" / open 2-1/8" / open 45 sq. ft. Santanna C-4347
4-15/16" 14-7/8" 2-1/8" / open 2-1/8" / open 50 sq. ft. Cal Spas, Martec, Sonfarrel, Advantage Mfg. C-4305
4-15/16" 17-3/8" 2-1/8" / open 2-1/8" / open 50 sq. ft. Advantage Electric C-4349
4-15/16" 17-3/4" 2-1/8" / open closed 45 sq. ft. Santanna C-4346
4-15/16" 17-3/4" 2-1/8" / open 2-1/8" / open 45 sq. ft. Santanna C-4449
4-15/16" 20-1/8" 2-1/8" / open 2-1/8" / open 75 sq. ft. Rainbow RTL-75, Custom Molded Products C-4975
4-15/16" 23-5/8" 2-1/8" / open 2-1/8" / open 75 sq. ft. Waterway Plastics C-4970
4-15/16" 23-5/8" 2-1/8" / open 2-1/8" / open 95 sq. ft. Waterway Plastics, Cal Spas C-4995
4-15/16" 26-11/16" 2-1/8" / open 2-1/8" / open 100 sq. ft. Rainbow RTL-100 C-4999

Click here to view photos of the end cap designs

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