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The TST Hibiscus Breeze Drop-INs help control unwanted odors and break down waste and tissue in your black water holding tank. The easy to use Drop-INs contain a special chemical that helps break down waste, and a blend of tropical-scented surfactant oils that trap unwanted odors in your tank, making your camping experience more enjoyable. The Drop-INs are RV and marine approved, non-formaldehyde and safe for all septic tanks—they’re even great for portable camping toilets! Each container comes with 15 Drop-INs.