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.