Part # WC10856S2X
Dimensions 13.25" L x 8.75" W x 8.75" D
Alternate Part #'s PSR50-4, STA-06-239
Sta Rite Posi-Flo II PTM50 O.E.M Cartridge
My pool filter is a Sta-Rite Posi flo II. The id plate says it requires cartridge # WC108-57S1X. Is # WC108-57S2X cartridge an acceptable replacement?If not what is?Also how often should the cartridge be replaced under normal conditions?
Hi, Richard. I was not able to find part number WC108-57S1X anywhere. Based on the part number provided WC108-57S2X is the correct replacement. Under normal circumstances, the cartridge should be replaced every 12-18 months of use.