Hydroguard is available in Canada. Google it again and look for a company in Mississauga, Ontario.Thanks for the replys fellow farmers, hydroguard isnt available in canada due to something in it. Can't even get neem oil here. I'll be cleaning and soaking everything in a dilute solution of 29% H2O2. Bought some new stones to allow the ones from before to just soak for a few days. Cant afford a chiller during this covid19 crap, will have to drop ice water bottles in each bucket. And that's the worst part. Each bucket has it's own airline but they all have the same issue. Slime on the stone first then the roots after.