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My system runs 365 days a year, between 8-10 hours per day. The Pentair pump is 2 1/2 years old but the Pentair cartridge filter tank is roughly 19 years old. I clean the cartridges every three months due to dust, mainly. Lately, when the pump starts, the system is full of air and slower than...

I have an in ground pebbletec pool with attached infinity spa and rock water fall, approximately 14,000 gal. I have a 2 year old Pentair Whisperflow, 2HP pump and a Pentair cartridge filter system with four Filbur FC1978 cartridges that are 1 year old and were cleaned one month ago. I clean them...