[m00se]

Originally Posted by OVT

My bad, backing soda increases pH, sorry about that. As others said:

http://www.calgaryaquariumsociety.co...Chemistry.html

Per that article:

"Calcium chloride also does the trick safely and inexpensively, but calcium chloride is not readily available in local stores. But you can buy it from chemical supply stores. "

Prestone Heat (in fact, all those beaded white ice melts) are calcium chloride. Prestone is used because it's been determined to be relatively pure. I use Ball Pickle Crisp Granules, because it comes in sane volumes and I rarely need to use it being that I live in liquid rock Upstate NY.