Quote Originally Posted by waste
I went back to a pool I had added 5 lbs of cya to 8 days ago and I saw ~ almost all of it still sitting on the bottom.
Wow. I'm surprised, but not shocked. There are differences in the way pool water works that I don't know if anybody fully understands. As a counterpoint, if I put CYA in a sock in the skimmer of my pool, it will be gone completely overnight from the sock (no holes ). I was amazed the first time I saw it happen. Testing indicated very close to the expected CYA change less than 24 hours after putting it in there.