Its great for melting snow on sidewalks and pavement, but . . . ?
If you need calcium chloride, all pool supply stores carry hardness enhancers - usually 97% anhydrous calcium chloride w/ 3% moisture content (and no other ingredient). You can get a 8 lb bucket for $14, enough to raise 6,000 gallons by 100ppm. Use 2-1/2 cups to 1 gal r/o water as dosing solution. I don't know why I ever bought "reef" calcium additives.
If you need a two-part additive, make a separate batch of baking soda solution. Restaurant supply stores like Smart & Final have their generic brand of 10 lbs for $4. Use 2-1/4 cups per gal, but first spread it on a cookie sheet (dry) and bake for about an hr to drive out the moisture & CO2.
Don't forget magnesium, 64 oz of epsom salt to 2 gal solution. Use this in equal parts to the above. Keep all 3 solutions separate, adding in dispersed/high flow areas.
This is stolen from Randy's Homemade Two-Part recipes on ReefKeeping online. [/B][/QUOTE]