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thank you very much for you guys help ,i would order a text kit from us. honestly i do not trust pool shop as well after they sell a algaeacid to me. it totally useless and very expensive. before the slam , CC level always in the range most time is 0.5. after slam the first result is still...

Thanks Ken, after black algae gone i got cc at 0.5,fc is over 16 from pool shop,and just add some acid and tap water into pool ,after a week the cc level is 1.5,fc still 15, i running swg and pump 12 hours a day. is there any reason cc reach this high? Thank you very much man.

I just bought a property with a pool one month ago, 3 weeks ago i found black algae in the pool. then pool shop sold me a bottle of algae acid to remove them, it failed. I searching by google and found this place, tried to find the solution. And i SLAM my pool by 10 kg Chlorine powder from...