Cal Hypo Change

[chem geek]

Take a look at this thread for more info on this issue.

A product with 100% pure Calcium Hypochlorite would have [EDIT] 99.2% available chlorine because the molecular weight of calcium hypochlorite is about double that of chlorine gas, but provides twice as much disinfecting chlorine per molecule so calcium hypochlorite and chlorine are roughly equivalent in available chlorine. [END-EDIT]. I saw one Material Safety Data Sheets (MSDS) that says 65-71% of the product (by weight, presumably) was calcium hypochlorite, but claimed to have 65% minimum available chlorine which [EDIT] is [END-EDIT] correct. Some products I've seen say they are composed of 60-80% Cal-Hypo (and call themselves "65"). Check the MSDS to see the actual weight percentage of calcium hypochlorite -- if it's less than 100%, then this is a diluted product with other inert materials you pay for, but that don't do anything.

I looked for, but could not find, a source for pure calcium hypochlorite except for small quantities that were expensive and used in labs. There could be something out there, however, that I couldn't find. Perhaps the bags you saw at Costco are your best bet, ***uming the price per pound isn't too high.

Richard