I'm thinking that the answer is no, but here's my dilemma.

Closing the pool today. I'm handling the chemicals but have hired a pro to purge the lines. Two days ago I brought the FC up to shock level with bleach. Yesterday I added a little more bleach to maintain shock level and added a quart of Leslie Algae Control (Polyquat 60 equivalent). On Sunday when I started this process, my pH was 7.6. TA was a little low at 70 but has been 70-80 all year with a steady pH of 7.6-7.8 so I thought nothing of it.

In preparation for today's closing, I ran a quick FC and pH. FC was 13 (CYA 40) and pH was BRIGHT purple (>8.0). Keep in mind, all I've done since Sunday (when the pH was 7.6) was add several gallons of bleach and the bottle of polyquat equivalent. We have sprinkles today but no measurable rain.

I'm running the filter and added Dry Acid hoping to bring the pH down before the pool guy gets here and shuts down the filter.

Can the polyquat cause this? Can I close with a high pH? I'm leery to add too much more Dry Acid because I don't to have any areas of high concentration if it hasn't fully mixed before the filter gets winterized.

Agh. Up until now I felt like I was right on top of everything.

Jim