Bulk Magnesium Chloride in Canada

[DiverDude]

I think the 'risk' with that kind of product is consistency (or lack thereof). Contaminants might not be present in the bag you have or the next bag but perhaps in the future ? After all, this stuff is meant to spread on the ground so if there's a little spill of something innocuous, who is going to care, right ?

That being said, we all know about the issues with a certain brand of aquarium carbon a little while ago so there are never any iron-clad guarantees but at least with an aquarium product you have a reasonable expectation of it being safe on an on-going basis.