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FC 1.5 PH 7.5 CYA 45 Hardness 160 Alk 90 The deep end of my pool has greenish/grayish stains or algae that cannot be brushed away. I tried an algacide and daily brushing but still nothing. We've had over 17 inches of rain this spring/summer in the event that has anything to do with it...

Is it necessary to add more DE after backwashing? If so, how does one know how much to add? Thanks in advance.

I have DE filter that does not take long to go from 13-15 psi to 20 and then beyond. When I remove the filter, the screen on top is depressed and algae and DE have collected on top of it. Is this likely causing the rapid rise in pressure? Instead of backwashing, should I just commit to...