Thank you Doc!

The only algae problem I have ever had was opening this season. I did not use PolyQuat when I closed last season and I probably let the chlorine go too low before putting the cover on. This is something that has always confused me. Are you supposed to wait until FC drops to a certain level before putting the cover on to avoid damaging the cover?

The pool is crystal clear now with the following levels:

FC: 6.4
CC: < 0.5
pH: 7.7
TA: 80
CYA: 50

It is 13,600 gal with a vinyl liner.

Thanks again!