Last summer I replaced the fiber filters and pump head in my Pentair DE48 filter. It was allowing DE to seep backinto the pool so I have now replaced the filter valve. It is a 1/1/2 inch system. I also had my pump rebuilt last summer when it dry seized.
The issue I am now facing is an excessive build up of pressure 30 psi (pentair recommded psi is 12) in the filter during the filter mode. when reaching 30 psi; water flow is restricted. I have torn down the filter (again) and cleaned the fiber filters ( i call them the bat wings). This fixed the problem for about 8 hours. I tried back washing when the pressure reaches the 30 psi mark, however, nothing but clear water is expelled. It brings pressure down for about 30 mins or so. I have check to make sure the plumbing is routed correctly. I'm at my wits end. any suggestions on what to check? or do? Next???
Stumped in Texas!