My 16K gallon pool's PH rises a little each day. I am constantly having to add muriatic acid several times each week to keep the PH at the proper level (7.4 - 7.6). However, this has caused my once very high TA to drop to 70. If I add baking soda it will raise the TA but my PH rises as well. My CSI is in an acceptable range (-.19 to + .26), depending on when I measure it. The calcium hardness is 425 and steady. my CYA is 100. My free chlorine is good at 3ppm. My pool was re-plastered last December. Why does my PH continue to rise? Will it ever stabilize? Any help with this is appreciated.
Mike
Mike