The Mega All-in-One Sewer Tank Treatment helps control unwanted odors and break down waste and tissue in your black water holding tank. The easy-to-use sewer tank treatments contain a special chemical that helps break down waste. A blend of lavender-scented surfactant oils trap unwanted odors in your tank, making your camping experience more enjoyable. The sewer tank treatments are RV and marine-approved, non-formaldehyde, and safe for all septic tanks. They're even great for portable camping toilets. Each bag comes with 10 treatments.• Extra-strength formula eliminates odors for up to 7 days• Helps break down waste in the RV holding tank• Ultra-concentrated treatment treats up to a 40-gallon tank• Does not contain toxic, formaldehyde-releasing ingredient bronopol• RV and marine-approved• Safe for all septic tanks• 10 treatments per bag Treats up to a 40-gallon tank RV and marine-approved, safe for all septic tanks 10 treatments per bag | Mega All-in-One Sewer Tank Treatment, Lavender, 10-Pack in Black