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Thanks for everyone's replies. I'm really torn on what to do. I might just live with it knowing that the liner is in it's twilight years but maybe I'll try sponge test. I really don't want the expense or trouble of constantly adding a sequestrant. Been running this pool for 10 years with the...

Minus a stain ID kit, can I be sure it's iron though? I could be wrong but always thought that copper was not as harmless to swimmers

I recently used a silverside but the stain was already there at the time and I thought it was a stubborn algae I couldn't remove.

Hello everyone. I was initially posting about this in the algae threads but not getting many answers. I have some light staining on my vinyl liner which I suspect is iron. Vitamin C removes it instantly. After reading the absorbic acid stain removal steps on this site, , I have a few questions...

Thanks for your help Richard. I'm going to hold off for now until maybe someone chimes in that has been through this process. Would the stains just return without a sequestrant. I would think they would but unsure.

So the vitamin C tablet cleared it right up. I'm going to follow the absorbing acid treatment steps. Before I start I want to make sure I know exactly what I'm doing. First, I need 0 chlorine correct? How important is my PH being 7.2 rather than the 7.4 I'm currently at? Also, is it possible to...

Thanks Richard. I added what bleach I had on hand and should be up around 20ppm. Need to get some more tomorrow. When I slammed it last week the algae disappeared only to return when my chlorine level came down. I guess I should have done the OCLT. I will this time for sure. Thanks again

Hi everyone, I've been learning here for years first time posting! I'm in a serious battle with some brownish colored algae. Pools been open for 2 weeks now, water is clear and my tests are pretty much dialed in but can't shake this large spot on the shallow end floor. I even broke down went to...