Man, I am going to chime in here just because.
I made my own Alk solution from the Randy Farley/something guy. (OK)
It works great, too great if you do not have your proverbial 'shite' together.
I began manual dosng. Cool. Unfortunately by the time the week ended I shot my Alk from 7.9 to 10.2.!!! My PH rose from 7.9 to 8.4. FFS, YIKES I said to myself.
Know YOUR tank personality!!!!
I pushed my system so out of whack in that one week it made me sick!!
Long story short, I have learned my system through MANUAL dosing that when I get my auto system running I can set BUT NOT forget.
TEST, TEST, TEST when you are trying something new.
onecansay.