I've been fighting green algae for almost a week now. I went to Walmart today and bought 15 gallons of bleach (again). I also picked up a bottle of the 60% polyquat - just in case. How long should I keep up the shock/brush/vacuum routine before it becomes necessary for me to add the poly? I wasn't keeping the level up to 12 at first but AM as of today. Hopefully, the 15 gallons will be enough to finally kill this mess. It's still light green and cloudy. I'm starting to get frustrated. (We used a mesh net this year to cover instead of the tarp like last year so it's full of silt and pine needles!) Thanks for any help y'all can give me!