I am doing two part dosing in my tank, I buy them from BRS and ship them to Saudi Arabia paying 3 times the actual cost, my dose has reached to 200ml per day of each CA and Alk, i have finally started thinking to change to a CA reactor, i have a Korallin S-1502 which i will convert into a Calcium reactor, my worry is of low PH as well as if this unit can keep up with my tank demand, the actualy water volume in my tank would be around 130g. I need advice on Korallin's C-1502 reactor.