For alkalinity solution, following Randy's recipe, I use 594 grams baking soda (from CostCo in the 13.5lb bag), baked at 300 for an hour to drive off moisture, then dissolved in roughly 1/2-2/3 gallon warm / hot ro/di water in a gallon jug (I use old, empty B-Ionic gallon jugs). I heat ro/di water (130-150degrees), add to a gallon jug, add baking soda and shake. Fill to one gallon total solution with ro/di water. Heating the water helps with dissolving the baking soda. When cooled, pour solution into gallon jug dosing reservoir from which alkalinity dosing pump draws fluid.
For calcium supplement, I use BRS's calcium chloride. The same basic process for mixing - heat 1/2-2/3 gallon ro/di water, pour into gallon mixing jug, add 500g calcium chloride (no baking), mix, add ro/di water to bring to one gallon total solution. Allow to cool, add solution to gallon jug dosing reservoir from which calcium dosing pump draws solution.
For magnesium supplement, I use BRS's magnesium chloride and magnesium sulfate. Similar mixing process - heat 1/2 gallon ro/di water, pour into gallon mixing jug, add 5 cups mag chloride and 3 cups mag sulfate, shake, add ro/di until one gallon total total solution. Allow to cool, add solution to gallon jug dosing reservoir from which mag dosing pump draws solution.
I have about 150 total gallons system volume with lots of sps, so my dosing pumps are busy and I am mixing solutions fairly frequently (every couple weeks). With a tank of softies you shouldn't be going through solution any where near as fast. If one were to start where I am now, a calcium reactor would make sense but I started years ago with one small frag and water changes could handle my calcium demand. Then I started dosing "purple up" when I had a few frags and calcium was dropping too much between water changes. Then as my sps grew, I had to start officially dosing alk, ca and mag to keep their levels where they need to be. And if you're doing it right, demand for supplements keeps increasing as one's corals grow and require more (until one's tank is packed). I have an Idaho Grape Monti cap that I got as a 2" frag and is now roughly 18" across. It's probably a giant calcium sponge. :lol2: