chlorine demand

I've been having issues keeping the chlorine in the pool ever since the water has been reset after 1.5yr of stagnant water and I've never quite experienced this unless I'm not measuring things right. In the past, I used to add less than half a gallon of liquid 10% chlorine daily and that used...

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...