Camco's TST MAX hibiscus breeze RV toilet treatment drop-ins help control unwanted odors and breakdown waste and tissue in your RV or marine waste holding tank. Just one drop-ins treats up to a 40 gal tank and stops odors up to 7 days. This product is RV and marine approved and is completely bio-degradable. It does not contain formaldehyde, pesticides or biocides and is safe for all septic tanks. It's even great for portable camping toilets! Includes (15) hibiscus breeze scented drop-ins. 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.