I am looking at using autopots with water with calmag with silicon in it. I have been mixing a few days worth at a time and then when I test ph in the water the next day it is like .5 higher. How does that work with a reservoir? Do you test ph in the reservoir every day and then adjust it as needed? Is there a way to keep it from drifting up like that on there? I use gh ph down with tap water on there. If you have to test and adjust the ph every day that takes a lot of the convenience of the autopots out from it on there.