Closing pool in 1 week, pool temp has dropped to lower 70's F.
Water crystal clear.
In past week noticing some blotchy areas greenish/yellow which brush off easily.
Did shock the pool twice in two weeks but appears to not made any difference.
More noticeable in shady areas.
Should pool be slammed prior to closing?? I use a solid cover with bags..
10,000 gallon fiberglass pool
readings today using TF-100
fc = 110
cc = 0
tc = 110
ch = 275
alk = 50
cya = 100 *** test strips show 30-60???
ph = 7.2