Hi Beakerbob,

I have a Calcium Chloride question. There was some question as to the purity of Dowflake awhile back... some element that I don't recall potentially building to harmful levels in our tanks. Has this been settled?

I ask because I'ill probably run out of the anhydrous CaCl that I currently use and found a local source for Dowflake. I don't know it's batch number but the front of the package states "77-80% pure". Will this be safe to use?

Thanks,
Tom