"special chlorinators"? Pure BS (barnyard slush) and hype. In your water, chlorine is chlorine. Period.

Cal-Hypo is well-known and well-documented. It is THE most volatile form of chlorine available to home-owners, but if handled properly is fine.

There's no free lunch. Cal-Hypo adds calcium to your water. Sooner or later this becomes its own problem--like when you have 500 or 600ppm and your water goes milky white.

Cal-Hypo must NEVER be used in an in-line chlorinator or mixed with other forms of chlorination--prior to being dissolved in your pool.
IT IS DEADLY DANGEROUS TO MIX CHLORINE TYPES!


Again, once it's dissolved in your water, one chlorine type is just like another, other than the ADDITIONAL by-products they release.