Recently I have had an issue with my pool pump and filter gauge not maintaining pressure. My pressure gauge normally stays around 12 after backwash or DE change, but in the last week the pool pump will get just enough water to rush through the filter, the gauge will read 15, and then suddenly it will lose all pressure and read 0. It will cycle every 10 minutes in the same way. The pool pump seems like it can't keep the water flowing. I checked for water leaks, didn't find any. I suspect some type of air leak but I am not sure. I'd like to get an idea of what I could be before I try to work on it or have to call a pool tech. Thanks!
** It may be notable to add 1) There is a very small crack in the pump near the lip of where the basket is and underneath where the gasket lid is located. 2) I recently change the filter valve. Did it to specs for pentair FNS
It is a 25,000 gal pool, single stage pump, FNS 36 DE filter.
