Looking at this system also IYE how foes it do with only testing and dosing for alkI LOVE my Alkatronic so much I ordered a Mastertronic. It's still sitting in the box though because the thought of the setup is giving me anxiety lol. The Alkatronic also did before I set it up but that ended up being a breeze.
Has your cal or mg ever been way off or does it do a pretty good job