Ecolab Klercide™ Sporicidal Active Chlorine is an effective rotational sporicidal for large surfaces with a broad spectrum of activity, specially formulated to help control the kinds of microbial contamination most likely to be found in a cleanroom environment, including difficult bacterial spores. Terminally sterilized by gamma irradiation, the active chlorine tablets are double bagged in a Grade C / ISO Class 5 cleanroom.