Best magnesium chloride for DIY

[Flippers4pups]

Been searching far and wide for the best magnesium chloride for Randy's recipe for magnesium supplement.

My fears are using one that is full of impurities, heavy metals, ammonia etc..... So, what's everyone using and what made you pick it? Was it fellow reefers recommendations, personal research, etc.......

Is over the counter, mass produced good? Pharmaceutical or laboratory grade better? What's safe, what is everyone using and where did you get it from?

Thanks in advance.

 

[bertoni]

I still have a lot of the Mag Flake left. It should still be available, and seems to be fine. Bulk Reef Supply and other vendors sells magnesium chloride that seems fine, as well.

 

[Flippers4pups]

Where did you get the mag flake from?

 

[hkgar]

I get mine from Bukl Reef Supply
http://www.bulkreefsupply.com/brs-bulk-magnesium-chloride-aquarium-supplement.html

 

[bertoni]

I got mine from Harvey Salt, but a number of aquarium vendors sell magnesium chloride now.