I vaguely remember seen some ads for those, in years past . . . but why in the world would you want one? For every 10 ppm of chlorine you get from dichlor, you get 9 ppm of cyanuric acid! When was the last time you tested your stabilizer (CYA) level?

Dichlor has its place, but as a routine chlorine feed? Wow! That seems to me to be just begging for problems.