TST RV Grey Water Odor Control removes grease buildup in your grey water tank, sink and shower drains. This grey water holding tank deodorizer comes in a fresh lemon scent. Four ounces treats a 40-gallon holding tank. It is 100 percent biodegradable, does not contain formaldehyde, is environmentally safe and is non-staining. Product is safe for septic tanks. Color: Yellow; Model#: 40252; Brand: Camco. Camco makes quality products for RVing, boating, camping, towing, tailgating, grilling and more. Our products help take your passion for the outdoors to the next level. At heart, Camco is a small company with big aspirations. Since 1966, we have earned a reputation for providing superior goods with high customer approval. At our core, we believe in manufacturing exceptional products and delivering superior service  all while providing a great customer experience. Explore your outdoor passion with Camco. Great memories are only an adventure away.