Quote Originally Posted by Tom Travis View Post
Thank you so much for explaining this. I have been aerating my pool for days trying to lower my alkalinity (is about 150 ppm) and it did nothing. My PH is at 7.5 and maintainig that. I will lower the PH and try it again.
Yup. That's why it didn't work. BTW, if you have a vinyl pool and don't have a heater or SWG system there's no reason to lower T/A. With vinyl pools the absolute max for T/A is 200ppm, not the 120-125 normally recommended. I like to think of the max as 180ppm, because it gives room if pH goes up or down.

So if your pool is vinyl, don't bother lower T/A. If you have a heater (gas or heat pump) and/or an SWG, or if you have concrete/plaster then you do need to lower T/A.