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I know there is a difference, but can anyone quantify it for me? It seems like when I cover the pool the chlorine lasts a lot longer. Thanks in advance

I did not test for CYA, assuming it is low to medium. I did have to add water this year, and the only CYA that gets in there is from the pucks that I usually use. After first shocking the pool to make it swimmable, I decided to go after the stains after joining the forum. I let the chlorine...

I have an in-ground 30,000 gallon pool that has gradually been accumulating reddish iron stains over the past four years- when I put a new liner in. To make a long story short, I think I will "shock" it with citric acid. I have read that the effect is almost overnight. I am aware that the pH...