Camcos TST MAX Lavender RV Toilet Treatment Singles help control unwanted odors and break down waste and tissue in your RV or marine waste holding tank. Just 1 bottle treats up to a 40-gallon tank and stops odors for up to 7 days. This product is RV and marine approved and is completely biodegradable. It does not contain formaldehyde, pesticides or biocides and is safe for all septic tanks. Its even great for portable camping toilets! Includes (8) 4 oz. bottles with a fresh lavender scent. Made proudly in the USA. Camco makes quality products for RVing, boating, camping, towing, tailgating, and grilling that help you take your passion for the outdoors to the next level.