Hello! I am trying to open my pool (a little late, I know!!) and I tested my water. My CYA was 120 ppm. I know the only way to lower it is to replace a portion of the water. My question is this: I live in middle TN, and we just had the major flooding in our area. When I tested the water, the ph was 8.7. I assume that this high ph level can be contributed to the rain water because my ph has never been that high. During the process of replacing some water to correct the CYA level, will this also help with lowering the ph? I tested my tap water (which is what I will replace the water with) and it was 6.8. Should I wait to adjust the ph until after I have corrected the CYA problem?
Also, I believe I remember learning that you should adjust your TA, Ph, and CYA BEFORE you shock. Is this true or is this something I dreamed up??
Thanks for any help you can provide!!