I have been using Calcium Chloride(CA) ,Sodium Carbonate(ALK) and a mixture of Magnesium Chloride and Magnesium Sulfate (MG) with a lot of success with by 14 gallon Biocube.
I use dosing pumps to add the CA and ALK and hand dose the Mag when needed about once per week or two. But you could do them all by hand.
My levels have been very stable with these products. I purchased the starter kit from
BRS but I think Red Coral in Calgary sells the chemical powders in bulk so Edmonton probably does as well.