I checked all hoses, no slits or holes to be found and made sure all clamps were in the right places and tight. I did find one pvc connection that goes from the pump to the filter/multivalve control that looks tight, but actually has some play in the threads, tightened it up and will check tomorrow morning. I did notice my psi was sitting between 15 and 20 (when it's this low it doesn't do the geiser thing, provided I open the air valve long enough) today so perhaps I have had several small air leaks that are slowly being taken care of by retightening all the clamps yesterday and the pvc connection this evening? I'll let you know in a.m.