We've moved to a house with a new pool. Used a couple of months last august. Noticed that the deep skimmer which is farther removed from the pump than the shallow skimmer will vortex, and eventually suck air. Last fall I added water (about 4 inches) to get this to stop. Had to do again in a month before closing. Opened the pool. same thing 2 days after having the pump on. Water level didnt seem to drop more than an inch.
A couple of points thoughts, in addition to what might be a pipe leak (lower water level over time)
1) deep end skimmer might simply vortex first because its maybe not level with shallow skimmer
2) the pool plumbing is 2 inch pipe, the pump 2 hp, a pool guy said the pump is big for the filter
3) the return flow pushes through eyeball jets, so possibly constricted outflow.
Im wondering if there is simply a large suction vacuum from the skimmer side to the pump (pump filter is 18 lbs pressure) and pressure build up on the outflow side? or am i making this too complicated?
thanks in advance!