Water looks fine with no signs of algae... now.

I know my CA is high, but my pH seems to stay pretty stable. I just used baking soda to raise my TA from 70 to 90 a few days ago. (thread in alk forum). I had to add another 500-600 gallons of municipal water today, so I will put some more Kem-Tek in now.

What is polyquat?