OK house came with a 25' Above ground pool, not sure if its vinyl or fiberglass. Found the pump and filter with two clean filter cartridges(big round cylinder things) in the shed. Its a Pentair Pump and filter, it says DE100 is the model on the filter. The pool had been sitting for probably two years and the cover had sagged and was ripped. Wrestled the cover off and got a lot of the leaves out not sure how much may be left in there. Got the pump assembled correctly and got it turned on and working. Added 12 pounds of DE because it said that a DE100 filter had 100sq ft and that needed 12 1lb coffee cans of DE. The pump was running at 20 PSI after about three hours the flow reduced and it was running at 24 PSI. I went to the pool store, Leslie, and they said that 20 PSI is too high it should be running at 12-13. I bought more DE and came back home. I took that filter out(heavy) and put in the second clean one and that running right now. Started at 20 PSI and is now starting to slowly climb.
Is it correct that it should only be at 12 -13 and if so what may be the problem? Also do I really need to put 12 pounds of DE everytime I clean the filter which is about every 3 hours right now?
I have a test kit coming from Amazon and I'll update this thread when it gets here.