Happy Campers Organic RV Holding Tank Treatment - 18 treatments ODOR FREE: absolutely no chemical or sewer smell ORGANIC: biodegradable, environmentally friendly, septic tank friendly EFFECTIVE: in extreme hot & cold temperatures ( over 100f ) EXTENDED DUMP INTERVAL: keeps on working ( don't have to add more before dumping ) LIQUIFY: waste solids & most ordinary household tissue ( no expensive special tissue needed )