NO, DO NOT USE TABLETS DESIGNED FOR SWIMMING POOL USE AS THESE MAY RELEASE AN EXPLOSIVE GAS CALLED NITROGEN CHLORIDE. When disinfection of secondary effluent is required, use a chlorine tablet made from calcium hypochlorite that is certified for wastewater disinfection by EPA. The tablets are very reactive and will kill 99% of the bacteria present in the effluent within 10 minutes. Follow all warning and precaution statements of the chlorine tablet manufacturer to protect yourself and the system equipment. .