^^ Yes very good link. I use the two part (technically 3 part, but the Mg is dosed by hand whereas the other 2 are automated).
Go to Costco and pickup a pack of 6 little boxes of Arm & Hammer.
One box fits nicely on a cookie sheet and then bake it in the oven for a couple hours to bake out the CO2.
Cheap and Easy! And the little boxes measure out almost perfectly for 1 gallon of mix.
P.S. I went down to the local plastics shop and bought food safe 1 gallon containers. If you get one with a spout on it then you can use that to pour into your measuring cup.
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