MAG flake, Dowflake in Canada?

[wetcoast]

Careful that your Dowflake is not made after December 2005 - as it has 7500x times the amount of bromine in it, which at this point in timeis is unknown on the effects for 2 part dosing regularly. Water changes should be fine apparently.

Magensium Sulfate (Epsom Salts) can accumulate as well - try to get a blend of Magnesium Chloride AND Sulfate. PM me, I know of sources to find it for under $2 a kg USP Food Grade locally.