Just to revive this thread to give aditional feedback.

2011 and 2012 I had cloudy pools that did not clear. I re read this whole post. What I can say is I did not use polyquat upon closing those two year. Is it related? IDK.

All I know is the past 3 pool closings I use polyquat. Upon opening, even with just my leaf cover, the pool stays somewhat clear. Just a fine layer of green on the bottom maybe. Pool cleared up fine the past couple of year with in days..

Not sure if it was that leslies algae stuff I added those two years.. Whatever it was it wasn't polyquat I know that for sure...

Well hope all is well here . I am sorry I have not been around.. Ill try to pop in more often.

Mike.....