TST Orange RV Toilet Treatment Drop-Ins *15-PackThe Camco TST 12 oz. Orange Drop-ins are an effective and environmentally safe way to treat your RV&';s septic system. Simply drop one unit down the RV&';s toilet to stop odors and treat the water tank.Features: Drop packet into your RV toilet to break down waste and tissue and treat both black and grey water tanks Stops odors for up to 7 days Fresh citrus scent Environmentally friendly Safe for septic tanks Contains 12 packets