I had this problem last year but I figured it was more because I was opening the pool in the middle of august with heat than a problem with the pool itself.
I started the opening process early this year (beginning of March) and got the PH to 7.6 with a CYA of 30.
I've been keeping the FC at 15-16. I'm showing an overnight loss of between 1-3 FC depending on the pollen that day.
Brush at least every other day. If I don't brush I can see very fine debris accumulate on the bottom of the shallow end and then I vacuum to the filter instead of brushing.
I can now see the deep end which is great, but I'm not happy with the amount of time this takes...
I can't help but wonder if the pump or pipes are too small to circulate enough water to make the process shorter. Or maybe the sand filter should be cracked open and checked on the inside?
The pressure is always under 10psi on the filter unless I add DE. If I add DE to bring up the pressure by 1psi, in anywhere from 2-5 hours I'm up to 25psi.
Anyone have any advice on how to make my equipment more efficient?
Anyone have any advice on anything more I can do to shorten the process?
Personally I think the sand is old and needs to be replaced. I've owned the house for 8 years and I've no idea how old the sand is.
here are some pictures of the equipment.