chlorine demand

Alright, here's some background, after going through the SLAM process a couple of times before it "took" (clearly I missed something the first time despite passing the OCLT) I think that I've got the pool free of anything actively consuming my FC (evidenced by my passing the OCLT last night with...

Hello! I am working my way through pool school and I believe I need to SLAM my pool but has a few questions first. I will attach a picture of todays CYA reading. Can I get away with a partial drain and refill or should I drain the whole thing? Some background….. We came home from vacation...

I am a new pool owner (or renter to be specific), I went on vacation for a week and came back to a very green pool. I watched a video online that said to "triple shock" your pool if it is a dark green; I did so and it improved but it was still green, so I triple shocked again and now the pool...