The Mega RV Sink Drain Drop-Ins freshen and deodorize RV gray water tanks, helping to eliminate sink trap and drain odors. They are designed for use in RV sinks, showers, and garbage disposals. 100% biodegradable and septic safe. Do not contain pesticides, biocides, or bronopol. Fresh lemon scent. 8 drop-ins per bag.• Freshens and deodorizes RV gray water tanks• Eliminates sink trap and drain odors• Great for use in sinks, showers, and garbage disposals• Helps prevent grease buildup• 100% biodegradable and septic safe• 8 drop-ins per bag Helps prevent grease buildup 100% biodegradable and septic safe 8 drop-ins per bag | Mega RV Sink Drain Drop-Ins, 8-Pack in Grey