Part # NFC2570

Dimensions 8.75" L x 8.75" W x 31.25" D

Alternate Part #'s 17-775-1691, 23701, FC-2570, FC2570, PSR137, UHD-SR137, UHDSR137, WC108-70S2X

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® II PTM-135
8 - 11/16 in.
31 - 1/4 in.
Top Style:
Top Inside Diameter:
Bottom Style:
Bottom Inside Diameter:
Filtration Area:
137 sq. ft.
Media Weight:
4 oz.
OEM #:
Unicel #:
Filbur #:
Pleatco #:

?     Asked on 9/12/2022by Sue Lawrence

I have a sta-rite cartridge filter. the replacement cartridge is WC108-53SIX. Also on the metal plate attached to to filter cover has eff. filter area 137 sq ft. I am not sure which replacement filter would be the correct one.

A  Answered on 9/12/2022 by InyoPools Product Specialist Craig C.

Hello Sue.  The Sta-Rite PTM 135 Generic Cartridge - NFC2570 is a compatible replacement filter element for the Pentair/Sta-Rite Posi-Flo II Cartridge Filter Model PTM135.   The NFC2570 filter element has 137 sq ft of filter area.  Attached please find the Sta-Rite Posi-Flo II Cartridge - Model PTM 135 exploded parts diagram for reference.  

?     Asked on 7/14/2019by Bob

My present filter’s size is 8 1/2” x 31” x 4” center. My filter casing is a Teel. 135 sq ft & 150 psi. Which filter is the correct number?

A  Answered on 7/14/2019 by InyoPools Product Specialist Lennox H.

Hi, Bob. This cartridge is close in dimensions but not exact, so it will NOT fit. We do not have a cartridge that matches your exact measurements, please provide the filter model so that we can locate the replacement. 

?     Asked on 4/9/2018by Don Brincka

I have a "Posi Flo" filter that specifies a "135 TXR" replacement cartridge. Does this filter qualify as a replacement?

A  Answered on 4/10/2018 by InyoPools Product Specialist Lennox H.

Hi, Don. It will not, the Filter, Cartridge 135 Sqft Generic - NFC2560 will. 

?     Asked on 7/12/2017by Inyo Visitor

you gave me this filter part no. if it does not fit is it returnable

A  Answered on 7/13/2017 by InyoPools Product Specialist Patrick P.

Yes, it may be returned just as long as water has not passed through it.

?     Asked on 7/6/2017by David

will cartridge NFC-2570 replace cartridge wc108-70s2x

A  Answered on 7/9/2017 by InyoPools Product Specialist Lennox H.

Hi, David. Yes, this Sta-Rite PTM 135 Generic Cartridge - NFC2570 is an aftermarket replacement for the WC108-70S2X.

?     Asked on 3/22/2017by Frank Sales

Just to be sure ------------- I have a Sta-Rite PTM 135 that calls for a Posi*Flo ii filter, part # WC108-7052X. Is your NFC2570 the correct replacement? Thank you.

A  Answered on 3/22/2017 by InyoPools Product Specialist Hector F.

Yes that is the correct cartridge for your filter.


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