Part # NFC2550

Manufacturer Code WC108-58S2X

Dimensions 8.6875" L x 8.6875" W x 25.6875" D

Alternate Part #'s 20201, FC-2550, FC2550, PSR100, PSR100-4, PSR1004, R173347, STA06242, UHD-SR100, UHDSR100, UNI605224, WC108-58S2X, WC10852S1X, WC10858S2X, 17-175-1685, APCC7294, PLEPSR100-4

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 100
Filtration Area:
100 sq. ft.
25-11/16 in.
8-11/16 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 9/25/2015by Henry Rivero

Will this filter sub for the Sta-rite PTM100

A  Answered on 9/29/2015 by InyoPools Product Specialist Lennox H.

Hi Henry, The Filter Cartridge 100 SqFt Generic (UHD-SR100) can be used in the Sta-Rite PTM100 filter.

?     Asked on 12/12/2015by rob

Will this filter element fit my sta rite 100 tx?

A  Answered on 12/14/2015 by InyoPools Product Specialist Robert M.

Hello Rob - The NFC2550 is the correct cartridge for the Sta-Rite 100TX.

?     Asked on 10/11/2016by Inyo Visitor

will this filter fit in Posi Clear RP Filter?

A  Answered on 10/11/2016 by InyoPools Product Specialist Hector F.

No these are a different design to the Posi Clear RP model cartridges.

?     Asked on 12/28/2019by Richard

Will this fit a Posi- Flo 11 pool filter. Dimensions are 250mm with diameter of 220mm

A  Answered on 12/30/2019 by InyoPools Product Specialist Lennox H.

Hi, Richard. This replacement cartridge will fit a Posi- Flo II with a diameter of 296.86 mm and a length of 652.46 mm.

?     Asked on 1/25/2020by gary

max flow rate for Filter Cartridge 100 Sq. Ft Generic (UHD-SR100). pool Tec is replacing my pool pump with a 2.5 hp. variable speed. pool size 16'x32' avg. depth 4.7' 40 ft. of head loss

A  Answered on 1/29/2020 by InyoPools Product Specialist Lennox H.

Hi, Gary. The max flow rate is 100 GPM. 


Est. Repair Time

Less than 1 hr

Tools Needed


No problem

Written on 4/5/2020 by Guest

Easy to install good for about 2 years then starts to fall apart.

Were these instructions helpful? 


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