I have a 1 hp Hayward Super Pump (sp1607z2msc7). When I set it to low I eventually lose prime. As a result my Aquarite swg stops generating and gives check salt/cell warning lights. I have tried with both main/skimmer open and individually (I have a separate valve for each). Is this normal? I don't have a timer. I'm a fairly new pool owner so I ran it on high last year not knowing what the switch was for.
The o-rings on the supply/return lines were replaced in the fall. Is there one on the pump that could be causing insufficient pressure? I don't think I have a leak as my pool water level is stable. When the pump is on high it works fine.