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Argh! before I drained, my pH would constantly drift upward. I assume the previous owner who used trichlor pucks never drained the pool so that's how the CH and CYA got so high. I really didn't want to do another refill, but I guess it would be for the best at this point. Does anyone know why...

Lets try that again. Is this Calcium Scaling?

Ok I drained and refilled about 45% of my pool water and here are the results: TA=120 pH=8.0 FC=8.0 CC=0 CYA=70-75 CH(Pool)=700 CH(Fill Water)=200 So I know I need to get some muriatic acid in the pool to lower the pH and TA then aerate and repeat, but I'm not sure how to tackle the high CH...

Yeah sorry that was a typo the TC=20 and yes it appears the main drain is plumbed into the skimmer. I decided to just drain down to the skimmer each night and bring the CH and CYA down slowly. I'll post my readings as I drain and refill. This site and contributors are invaluable to any pool...

Ok I cannot get my main drain to drain. I tried moving both valves in opposite directions from their original positions but the main drain does nothing. Both valves appear to only change circulation to either pool only, or pool and spa, or spa only. I'm assuming the main drain is plugged...

Thank you all for the replies. Received my TF-100 Test Kit and confirmed CYA well over 100. I'd say about 1/2 the way up before it reaches the 100 mark. Checked Calcium Hardness and stopped after 40 drops of absolutely no color change. So I'm thinking a partial drain of 50% to being with...

I just ordered my TF-100 Test Kit so I'm not sure what my readings are yet, but I've been getting my water tested at a pool store. I was told my PH and Chlorine levels are fine, and that my Conditioner was over a 100 so everything was good to go. My water is clear so I trusted that everything...