Part # NFC2530

Manufacturer Code WC108-56S2X

Dimensions 8-1/4" x 4-1/8"

Alternate Part #'s 15201, 17-175-1675, APCC7192, FC-2530, FC2530, PLEPSR50-4, PSR50, PSR50-4, PSR50-40, PSR504, UHD-SR50, UHDSR50, WC108-56S2X, 17-775-1675

Product Description


  • Our generic replacement cartridges are less expensive than the original manufacturers' brands yet still meet the same high quality standards.  The key components of a cartridge - filter media, core, and end cap - are all designed for maximum water flow and cartridge life.
  • The filter media is point bonded polyester with even fiber distribution which results in an even dirt load and increased water flow.  
  • The Sharp & Uniform pleated media provides filtration area (square footage) that meets or exceeds the original manufacturers' specifications.  
  • An open core design provides sturdy support for the media without restricting flow.  Increased flow rates result in less wear on the pump and reduced energy usage.  
  • Anti-microbial end caps inhibit the growth of bacteria, mold and mildew while supporting the core and media.
  • Banded Pleats maximize flow during operation, and help to reduce the frequency of cleaning.  Banded pleats also make the cartridge easier to clean.

Not Your Cartridge?

Is this not your Cartridge? Don't worry, we carry thousands of Pool Filter Replacement Cartridges to replace all of the most popular OEM brands such as Sta-Rite®, Pentair® / Pac Fab®, Hayward®, Purex®, American Products®, Jacuzzi®, Hot Springs®, Coleman®, and more. Click here for more Pool Filter Replacement Cartridges


All manufacturers’ names, brand names, trademarks, images, symbols, descriptions, and part numbers are used herein for reference purposes only.


You should consider the Microban version of this filter!

Why Microban Protection?

Water and an ample food source provide the ideal condition for bacteria to quickly multiply and grow. In fact, on an unprotected surface, some microbes can double in number every 20 minutes. And only when they’ve multiplied to hundreds of thousands, can they actually be seen by the naked eye.

The images below show bacteria growth on a standard pool filter cartridge versus a pool filter cartrdge infused with Microban® antimicrobial protection over a 24 hour period.

Microban Pool Filter Cartridge

After viewing these images, you can see how Microban® protection begins to work immediately, disrupting key bacterial cell functions so that bacteria are unable to grow or reproduce on the surface. While on the unprotected surface, bacteria quickly multiply.

Top End Cap Top End Cap
Bottom End Cap Bottom End Cap

Product Specifications

Filter Model:
Posi-Flo® TX/TXR/PTM 50
Filtration Area:
50 sq. ft.
8-11/16 in.
13-5/16 in.
Top Inside Diameter:
4-3/16 in.
Bottom Inside Diameter:
4-3/16 in.
Top Style:
Bottom Style:
Media Weight:
4 oz.
OEM #:
Unicel #:
Filbur #:
Pleatco #:

?     Asked on 4/26/2013by Guest

My cartridge filter says it is a Sta-Rite Posi-Flo II model PTM 50. It says that the replacement cartridge is WC 108-56S2X but that filter does not reach the top of the filter housing and water is allowed to go all around the cartridge and not through the filter. I'm confused. Any ideas?

A  Answered on 4/26/2013 by InyoPools Product Specialist Patrick P.

Usually pool filter cartridges do not reach the top of the filter. The water enters the filter and then penetrates the cartridge before returning to the pool. Part number WC 108-56S2X is the correct cartridge for the PTM50.

?     Asked on 9/4/2019by Inyo Visitor

mine measure is this the right filter 9X 18

A  Answered on 9/5/2019 by Industry Professional

No, the 17-175-1675 is 50sqft, 4-3/16"ot, 4-3/16"ob, 8-11/16" diameter x 13-5/16" length, used on older StaRite Posi flo filters. 

?     Asked on 9/5/2019by James Dunn

I have a StaRite Posi Flow II model PTM 50 filter on my spa and I want a replacement filter with antimicrobial properties. What do you recommend and what does it cost? The nameplate on the filter says the replacement is WC108-5652X Thank you

A  Answered on 9/12/2019 by Industry Professional

Part# APCC7192M is the replacement cartridge with the microban


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