I live in NY and we had about 3 days of constant rain. My pool water rose almost to the top of the skimmer. I felt it was a good opportunity to backwash the filter while removing some water. After backwashing until glass was clear, I stopped the pump and then rinsed for around a minute until the water was at the level I wanted. After putting the lever on Filter, my pressure was about 15psi. That is around where it was before doing the backwash. Is that a good amount of pressure for normal operation?
I tested my water after doing the backwash and had a PH of 7.7, FC of 11, No CC and CYA of 50. Did the CYA lower because of the extra water from the rainfall? Pool math says to add some stabilizer to bring CYA to 80. That should also lower my PH to hopefully the correct 7.5. I will stop chlorine generation so that my FC can go down. Thank you for the advice.