I have a 2 year old Hayward Pro-Grid DE filter that I just turned on for the season, the past two seasons my pool builder opened for me, so this was the first time I opened myself.
I have a 30,000 gallon gunnite pool in the northeast.
My chemistry is pretty good, a touch high on the PH, but I just put in some MA.
My concern is the PSI is reading about 12-13 immediately after cleaning the grids, backwashing pre charge.
That seems really high, and the pool store I buy chemicals told me I never want to let my DE filter go above 15 PSI. That means I have basically 10% increase in pressure before backwashing.
I read the manual and it does not mention starting or ending pressures, only 8-10 PSI higher than a pre-coat.
That would be in the 20-23 range.
I am a bit confused on this. Do I have a problem with my plumbing? I checked my skimmers and they are clean, is my pre-charge PSI of 12-13 OK and my pool store is wrong.
Can anyone shed some light on this for me with regards to DE and my system in particular?