First post on ANY forum. Inherited pool with new house. Algae almost gone. Water clear. Forsaking pool store as have already been subjected to sales pressure.
Last complete test done at Leslies. TF100 on the way. Currently have basic chlorine/ph test kit left by previous owner.
Question is this, have noticed that immediately post backflush pressure will drop to 16 psi, but will rise to 30 psi within 24-48 hrs. This has happened multiple times. New filter grids installed in Feb.
Unable to bleed air from filter manually after cleaning pump basket.
Will residual air pressure prevent filtration through entire grid causing pressure to rise this quickly?
If there was a blockage I would not expect pressure to decrease at all. How can I obtain a flow diagram for filter as well as grid cleaning procedure? Have opened filter housing, grid removal not immediately obvious.
The service rep who replaced the filter grids did not mention any other problems save for the apparently broken air relief valve, or does this particular unit have an automatic air bleed system? thus rendering my theory moot.
The filter is a Hayward micro-clear DE720S w/ 72 sq/ft grids. 2.5 hp AO Smith pump. 24k gal. IG. plaster. chlorine. pool built 1995. fountain. tree over deep end.