I started using Prestone Driveway Heat as my CaCl mixture, and a brown substance has settled to the bottom of the jug! I saw in Randy's article that the Prestone stuff was pure, but what is this brown crap? Hopefully I'm not poisoning my reefs....
i use Heat myself. i mixed mine in a gallon jug, and its as clear as day 1. i know of a few others here that have used it with no problems reported. sounds like your impurities are coming from somewhere else. like the water or the jug itself.
I too had the stuff at the bottom. I just treated it like Kalk and didnt use the last 1/4" or so of the gallon. My tank so far has been very happy and I have noted no ill effects. I am now on my third gallon and I guess I started it some time in early December/late November.
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