The TST Orange Drop-Ins 30 Pack help control unwanted odors and break down waste and tissue in your black water holding tank. The easy to use drop-ins contain an ultra-concentrated formula with a special chemical that helps break down waste and tissue. It also contains a blend of citrus-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 30 drop-ins.