I have a 14,000 gallon play pool built in 1986. It has the Paramount in-floor cleaning system, a large sand filter, and a single speed 1.5HP pump. I also have a Jandy Aqualink RS system from 10 years ago. There are 5 circuits with 2 heads per circuit. From what I can find online they are 18-20 gallon per minute flow heads. I also read that you should have 12-18 psi on the filter gauge. I run the system with return water flowing only to the in-floor jets. There are two return nozzles in the side walls but I've never really run them. The pressure gauge on top of my sand filter reads 35-38 psi all the time. I backwash about every month and the gauge never really changes, same before and after the backwash.
From what's I've been reading it sounds like maybe my pump is oversized for my pool. Does this make sense?
Would a variable speed pump save me much money? I have a high efficiency motor (special ordered) which saves some electric over the standard pool motors. Say I need to deliver 40 gallons per minute to the in-floor nozzles. Does this mean I would run the pump at that flow rate?
Also what variable speed pump to get. The Jandy integrates with the Aqualink but it looks like my system is too old to link to. If I get one I would want the permanent magnet motor.
Also one disclaimer, I'm an electrical engineer