Thanks for the links. The one thing missing though (unless I missed it) is how much acid to add and how often. When I had a problem with high PH and TA a few years ago, the local pool dealer told me to add 1/2 gallon of acid twice a day and keep the pump running 24/7. I've started the process using that advice. With the PH being normal I've added a submersible pump and aimed the return jets upward to aerate the water.