Quote Originally Posted by BigDave View Post
Two Cups was way too much so... try a half Cup at a time, let it dissolve / mix for a couple hours then retest.
. . . but we know that, only because of the results . . .


Sounds like a 1 cup dose might be it? The pH rise you experienced is not expected for a 3500 gallon pool with a TA=120.

See Pool Chart link below -- complete it, so we know more about your pool, and PARTICULARLY, about how you tested. -Ben

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+ It's much easier to answer your questions, when we have the details about your pool in one place. We often 'waste' the first few posts back and forth collecting information. So, please complete our new Pool Chart form -- it takes about 30 seconds, but will save much more than that.
Pool Chart Entry Form