I have been struggling with an issue with low flow. I have a 1.5HP hayward variable flow pump followed by a S210T sand filter followed by a hayward inline chlorinator. I am experiencing the following in each of the vari-flow positions:
Filtration - low flow and the pump chamber does not fill with water (1/2 full) but I can see a steady flow coming in
Recirculate - same as filtration with maybe slightly more flow but still pretty low
Waste- Full pressure with full prime and full pump chamber
Backwash - Full pressure with full prime and full pump chamber
I was initially thinking that the sand needed changing but since recirculate still has low flow I am thinking I have a clog somewhere in the return lines. I just bought the home/pool and it is very old with only 1 skimmer (and one working port) and 2 returns (24k gals). Any ideas?