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Thank you Richard320, I didn't know about the CYA dilution method. I will try it. Also thanks for the tips on slowly changing water out.

Hello, I moved into a new house with a pool. I have never owned a pool before. The pool is inground plaster 29,500 gal. I have purchased the TF 100 test kit. I have been testing and found my CYA out of range high. It looks like the previous owner was using dichlor shock and chlorine pucks. So...

Thank you knauss, for the info.

Hello, I have just moved into a house with a swimming pool with hot tube attached. I have zero knowledge of how to maintain and care for it, but would like to do it myself. Also would like to know what is the best water test kit to use, thanks for any help