Pentair Black O-Ring | Sta-Rite Posi-Flo II Cartridge Filters | WC9-3 Calcium Hardness Frequently Asked Questions (FAQs)

Frequently Asked Questions (FAQs)

Pleatco point bonded media is uniquely formulated to our specifications

as earlier blow-molded tank configurations may differ

replacement filter cartridge engineered for Caldera Spas systems

rinse with clean water and return the cartridge to the filter

Pentair Black O-Ring | Sta-Rite Posi-Flo II Cartridge Filters | WC9-3 Calcium Hardness Frequently Asked Questions (FAQs)The Pentair WC9 3 is the OEM replacement black O ring for Sta Rite Posi Flo II pool and spa cartridge filters, keeping the filter housing sealed and operating at full efficiency. IMPORTANT: LUBRICATION REQUIRED SOLD SEPARATELY Always lubricate this O ring with a silicone based lubricant before installation. We carry the Pentair R172351 Lifeguard Silicone Lubricant the OEM matched product for Pentair equipment. This O ring maintains the pressure seal