Pentair Cartridge 520 sq. ft. | Clean & Clear Plus Filter 520 sq. ft. | R173578 PD165 It includes Key Nos

It includes Key Nos

or inability to complete a proper backwash cycle

Backup Valve opens every 3 minutes for 30 seconds allowing the cleaner to backup and change directions

serviceable union joint that allows the pump or filter to be disconnected from the plumbing without cutting pipe

Quantity Included Set of 2 Also Known As PKG188Z Fits Into

Pentair Cartridge 520 sq. ft. | Clean & Clear Plus Filter 520 sq. ft. | R173578 PD165 It includes Key NosThe Pentair R173578 is the OEM replacement filter cartridge for the Clean & Clear Plus 520 sq. ft. cartridge filter, restoring full filtration capacity to one of Pentair's largest residential cartridge filter systems. IMPORTANT: 4 CARTRIDGES REQUIRED PER FILTER The Clean & Clear Plus 520 sq. ft. filter requires 4 of these cartridges for a complete service. This listing is for one (1) cartridge. Order 4 to complete a full replacement set. IMPORTANT: