I'm replumbing my 20k gallon in-ground pool to replace my old power hog pump with a new Pentair Intelliflo VF. While I'm at it, I'd like to optimize the plumbing configuration. My pool equipment is nearly level with the pool coping, ie about 6" above water level.
My primary questions is where should I put checkvalves, if any. My secondary question is if this config sounds optimal.
My plumbing sequence is as follows:
(1) 2.5" suction from pool (combination/ratio of water from two bottom drains and single skimmer occurs in skimmer basket by one of those plastic widgets)
(2) pump (Pentair Intelliflo VF)
(3) 3-way valve (Jandy)
(3a) to sewage drain (to empty pool water)
(3b) to filter
(4) filter (Jandy CL460)
(5) 3-way valve (Jandy)
(5a) 1.5" return to pool sweep (Polaris 360 pressure side boosterless sweep)
(5b) to heater
(6) heater (Jandy LX400)
(7) salt chlorine gen (Jandy Aquapure 1400)
(8) 3-way valve (Jandy)
(8a) 2" return to side wall outputs (4)
(8b) 1.5" return to floor outputs (2)
Does this look like a good configuration? Any advice for improvement?
Any problem with putting the pool sweep after the filter? The current config attaches it before the filter but causes frequent clogging of the 360's filter screen. I'd prefer to not clog its very small filter screen or pump unfiltered water back to the pool.
Should I use checkvalves anywhere? My current plumbing has one between filter and heater but I don't know why. Any reason to put one between heater and salt chlorine gen to avoid chlorine going back into equipment?
Is it a bad idea to directly plumb the pump output into the sewer (via 3-way valve) to empty water from pool or vac to sewer? Maybe it needs an air gap? Although I don't want the sewer open to the air. I don't want to pump high flow water and back up sewer into the house drains!! That would be bad.