This feeder is designed to use only Trichlor-s- riazinetrione OR Bromine tablets- slow dissolving type. UNDER NO CIRCUMSTANCES MIX Trichlor or  Bromine with Calcium Hydrochlorite, with other forms of concentrated chlorine or with other chemicals. FIRE  AND/OR EXPLOSION MAY RESULT. NEVER use oils or grease to lubricate o-ring. Oil in contact with Trichlor OR Bromine may result in FIRE. Lubricate o-ring with approved silicone o-ring lubricant only.