Dowflake....found

[lily13a]

Is a calcium reactor necessary to add the dow flakes and if not how do you add, and how do you add the mag flakes. Thanks

[Reefer Rob]

This how it's used:
An Improved Do-it-Yourself Two-Part Calcium and Alkalinity Supplement System


To make it easy you need 2 dosing or aqualifter pumps and timers, otherwise this is a low-tech solution.