Camco TST Lemon Scent RV Grey Water Odor Control, Stops Sink Trap Odors, For Use In Drains, Sink Traps and Waste Vents, Treats up to 8-40 Gallon Holding Tanks (32 Ounce Bottle) Eliminates odors Remove grease buildup in the gray water system Fresh lemon scent 32 oz bottle 4 ounces treats 40 gallon gray water tank