I’ve been using Randy’s DIY two part from around 2008 or so. Extremely happy, with corals growing like weeds, and only costing me around 3 bucks a year for dosing alk, calc and mag. At the time I could not get DowFlake and ended up using Prestone Driveway Heat for my calcium source. Well, I just made my last gallon from that original 50 pound bag, and am in need of more. Now since then rumblings have been going around that they changed their source or processing, resulting in more bromine. Don’t know if it’s true or not, but I’ve now noticed that SWI’s Prestone Driveway Heat is harder to come by. Note that although labeled as “Prestone”, it is made by SWI (Scotwood Industries). Searching around, my local HD now sells SWI Winter Heat ice melt. In looking at the MSDS’s (now just called SDS), both the Driveway Heat and Winter Heat appear to be the exact same MSDS with all their numbers. Not knowing for sure, and the potential bromine issue, and now no longer mentioning percentages of ingredients in their SDS (labeled as proprietary), I was now reluctant going with this product.
So here’s the crazy part….instead of going with the SWI product, I searched other Calcium products and found Nedmag Calcium Chloride Tech (also at HD) that includes the percentages in their SDS. I now know the range of percentages, but don’t know trace elements that might be there. I also know, from the percent of calcium chloride, that it’s the anhydrous form, similar to the Prestone product. I did attempt to buy this yesterday, with my local HD stating that they had 471 50 lb bags only to find that, yes they have it, but not on the floor yet.
So here’s the crazy part….instead of going with the SWI product, I searched other Calcium products and found Nedmag Calcium Chloride Tech (also at HD) that includes the percentages in their SDS. I now know the range of percentages, but don’t know trace elements that might be there. I also know, from the percent of calcium chloride, that it’s the anhydrous form, similar to the Prestone product. I did attempt to buy this yesterday, with my local HD stating that they had 471 50 lb bags only to find that, yes they have it, but not on the floor yet.