Where to buy Magnesium Chloride Hexahydrate in 50lb bags?

[TheCoralExchange]

As states, curious to know where I could purchase a 50lb bag of Magnesium Chloride Hexahydrate, as I need multiple bags. Alot of different de-icer out there but can't seem to find anything USP grade which would alleviate concerns of pollution.

I'm not looking to use BRS, but have no issue ordering it online if it can't be bought locally.

Thanks for any help anyone can provide.

 

[KrisReef]

Bare Ground Calcium Chloride Pellets 1,000-Lb. Super Sack, Model# BGCCP-1000 | Northern Tool

Bare Ground Calcium Chloride Pellets are a powerful ice melter that generate heat as they melt tough ice and snow. The exothermic pellets start to ...

www.northerntool.com