However, my pump has problems priming, as if it’s trying to push a head of air, and often will blow water backward through the suction lines when the pump is shut off. This did not seem to have any detrimental effect on anything. I cut this pipe and capped it permanently as I could not determine its use. I think the actual efficiency of the pump was at least half before I cleaned the cartridges. My Hayward variable speed became a monster at 3300 rpm and the 1 1/2 inch capped but notched pipe started spraying water out at anything over about 2000 rpm. They had probably not been cleaned in at least five years, maybe ever. I recently pressure washed my four filter cartridges. I determined that the 2 inch pipe actually aerates the spa jets. Someone explained this is how the spa aerates. These are capped off but have notches cut into them below the cap. There are two pipes coming up out of the ground near the pump. At some point someone repiped things, my main drain has no suction.
Variable speed pump, cartridge filter, heater, pool and spa. John Posted: 80’s gunite pool, new house for us.
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