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So it seems that algaecide should only be used for closing a pool. Polyquat 60 will be degraded by chlorine, and by this experiment chlorine will be degraded by Polyquat 60. After reading Algaecide - Further Reading it is clear why Polyquat 60 is useful for closing the pool. So the next...

I figured that adding a maintenance dose of algaecide every week would allow me to reduce my SWG output of chlorine making it (the generator cell) last longer. I normally run a steady free Cl level of 4 to 6. I added some algaecide. Days later some visible algae started in places. I noticed that...

Let me thank you all for your help! ali

I actually read these threads, each several times. I learned a lot. The chemistry was enlightening. I can see that I need a higher level of free Cl to truly rid the pool of lingering algae, SLAM. I will do it. "Your copper level is not good- copper containing algaecides?? Got any stains from...

I have a 32,000 gal PebbleTech plaster pool here in Florida. It has around 80% sun exposure through the day. The area is screen enclosed. Pool usage is Zero, an expensive decoration. It has a built in hot tub section with a waterfall into the pool with around a foot drop. The aeration from that...