The Camco TST Orange Power Drop-Ins eliminates odors while adding a fresh scent to your holding tank. All you have to do is drop in one packet into your tank and it will last up to 7 days. One packet will treat 40 gallons and is completely biodegradeable. 15 treatments come in a resealable package. Fresh scent 15 treatments included 100% biodegradeable | Camco TST Green Drop-INS, 15-Pack in Orange