Unicel UHD-SR137 replacement filter cartridge for Sta-Rite Posi-Flo II PTMUnicel UHD-SR137 Replacement Filter Cartridge for Sta-Rite Posi-Flo II PTM In stock$12799
Unicel UHD-SR137 replacement filter cartridge for Sta-Rite Posi-Flo II PTM
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Unicel UHD-SR137 Replacement Filter Cartridge for Sta-Rite Posi-Flo II PTM

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$12799
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Quick overview

  • Built for the Posi-Flo II PTM Unicel UHD-SR137 is the direct replacement element for the Sta-Rite PTM 135 cartridge filter.
  • Full size element 8-11/16 in. outside diameter by 31-1/4 in. long, so it seats on the original manifold.
  • Rated area Listed at 135 square feet on the title and product name, and at 137 square feet on the element attributes.
  • Sold as one element Order the quantity your filter body holds.
  • Restores flow A collapsed or clogged element drives filter pressure up and turnover down.
  • Rinse and reuse Cartridges clean with a hose and a soak, and get replaced when the pleats no longer come clean.
Full description and specifications ↓

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Product details

The Unicel UHD-SR137 is the replacement cartridge element for the Sta-Rite Posi-Flo II PTM 135 filter. It measures 8-11/16 in. across the outside diameter and 31-1/4 in. long, which is the size the Posi-Flo II PTM body is built around.

A note on the rating

The source data lists this element two ways. The product name and title call it 135 square feet, matching the filter model, while the element attributes and the part number itself point to 137 square feet. It is one cartridge either way, and the dimensions above are what determine fit.

When to replace it

A cartridge is done when filter pressure climbs back up quickly after a cleaning, when the pleats stay grey after a soak, or when the fabric has gone soft and the pleats lean over. At that point the element is passing dirt straight back to the pool, and no amount of hosing will bring it back.

Specifications
Brand Unicel
Manufacturer part number UHD-SR137
UPC 678285190312
Type Replacement filter cartridge
Outside diameter 8-11/16"
Length 31-1/4"
Square footage 137 (listed as 135 SQFT in the product name)
Filter manufacturer Sta-Rite
Fits Sta-Rite Posi-Flo II PTM 135 cartridge filter
Shipping weight 8.6 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 135 or 137 square feet?
The source data carries both. The product name and title say 135 square feet, while the element attributes and the part number say 137. Physically it is one cartridge, the UHD-SR137, at 8-11/16 in. by 31-1/4 in.
What filter does it go in?
The Sta-Rite Posi-Flo II PTM 135 cartridge filter.
What size is the element?
8-11/16 in. outside diameter and 31-1/4 in. long.
How many do I need?
One per element position in your filter body. Check the number of cartridges the tank holds before ordering.
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