I have a Hayward pro-grid DE filter
Here is my problem. This pool was a mess chemically and cloudy when I started. I finally got the chemicals correct, but it was still very cloudy. Your forums gave me some clues. I checked the filter grids and found them to be in terrible shape. I replaced these, lubed the gasket, secured the filter cover good and added the correct amount of DE powder through the skimmer. As a note, the handle broke on the Hayward vari-flow valve, so I replaced the entire valve cover. I also lubed this well during install before tightening all the bolts. Also, I made sure the cover was in the same position as the old one when installing.
As a result, the pool water is crystal clear. Now I need to clean the bottom.
If I change the valve to backwash, the automatic vacuum works great. The pressure gauge shows it running at about 10lbs of pressure. When I switch to filter, the pressure goes up to about 20-25lbs and the suction is not as good. It isn't good enough to cause the vacuum to move about. I have emptied the skimmer basket and the basket under the clear cover near the motor. I also checked for leaks. I don't see any. I also don't see any air coming out of the returns or under the clear cover.
I can't figure out what I am doing wrong. The pool is beautiful now except the bottom. Any advice you can give would be awesome.
Also as a note- I didn't replace the spider gasket (it didn't look great) in the valve. Could this cause the problem listed above? The valve turns fine and I don't see it leaking at the backwater exit.
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