Just like the title says, my TA has been slowly increasing since March and I can't figure out why. I have not added any baking soda, washing soda, or borax. According to my log book, in March, my TA was 80, and it has slowly crept up, and now it is 100 this week.
The only chemicals I've added since March has been CYA, muriatic acid, calcium chloride, and HASA liquid chlorine. I had to bring my CYA and CH up after we had several heavy rains, that caused the pool to fill all the way up, and me to have to pump it out to get the level back to normal. Liquid chlorine is added daily, and I use half a gallon of 12.5% on a sunny day (3 ppm). Acid is added as needed.
What could be causing the rise in TA?