Unicel UHD-SR50 replacement filter cartridge for Sta-Rite Posi-Flo filtersUnicel UHD-SR50 Cartridge, 50 Sq Ft In stock$6299
Unicel UHD-SR50 replacement filter cartridge for Sta-Rite Posi-Flo filters
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Unicel UHD-SR50 Cartridge, 50 Sq Ft

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$6299
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Quick overview

  • Sta-Rite Posi-Flo replacement Unicel builds this element to replace the Posi-Flo cartridge, and it is also referenced as TX-50.
  • Measured dimensions 8-11/16 in outside diameter by 13-5/16 in long, so it can be checked against the element you are pulling out.
  • Filter area Listed as 50 sq ft in the product name and description, and as 52 sq ft in the product attributes.
  • Unicel part UHD-SR50 The number to match when you reorder.
  • Rinse, do not scrub Hose a cartridge from the top down between the pleats, and avoid a pressure washer, which drives debris into the fabric and tears it.
  • Replace on pressure, not on looks When clean starting pressure creeps up and will not come back down after a wash, the element is done.
Full description and specifications ↓

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Product details

The Unicel UHD-SR50 is the replacement cartridge element for Sta-Rite Posi-Flo filters, also referenced as TX-50. It measures 8-11/16 in across the outside diameter and 13-5/16 in long.

A note on the rating

The sources for this cartridge do not agree on filter area. The product name and description call it 50 sq ft, while the product attributes give 52 sq ft. Both readings are carried here rather than picking one. The dimensions are the dependable check: measure the element you are taking out and match it against 8-11/16 in by 13-5/16 in.

Getting the life out of it

Cartridges last longest when they are rinsed properly. Work a hose from the top down and spray between the pleats rather than across them, and leave the pressure washer alone; it forces dirt deeper into the fabric and cuts the media. A soak in cartridge cleaner once a season lifts oils and scale that plain water will not.

When to replace

Go by pressure rather than appearance. Note the gauge reading with a genuinely clean element, and when that starting number creeps up and stops returning after a wash, the cartridge has reached the end of its service life.

Specifications
Brand Unicel
Manufacturer part number UHD-SR50
UPC 645544025302
Type Filter cartridge element
Outside diameter 8-11/16 in
Length 13-5/16 in
Filter area 50 sq ft in the product name and description, 52 sq ft in the product attributes
Filter manufacturer Sta-Rite
Also referenced as TX-50 Posi-Flo
Shipping weight 4.2 lb
Ships Parcel

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Customer reviews

Questions and answers

What people ask about this product, answered by our pool techs.

Is this 50 or 52 square feet?
The sources disagree. The product name and description call it 50 sq ft, while the product attributes list 52 sq ft. The dimensions, 8-11/16 in outside diameter by 13-5/16 in long, are the reliable way to confirm the fit.
Which filter does it go in?
It is the Unicel element for Sta-Rite Posi-Flo filters, also referenced as TX-50.
What are the dimensions?
8-11/16 in across the outside diameter and 13-5/16 in long.
How do I know when to replace it?
Watch clean starting pressure. When it climbs and no longer drops back after a proper cleaning, the media is loaded up permanently and a new element is due.
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