I started using 5 Star Happy Camper in my holding tank last season and could not be happier with the result. After 30 years of having boats with holding tanks I found a product that works and kills the odor period. They guarantee it will stop the odor or you get your money back. Good for boats campers or whatever. I urge you to try it if you have any related odor problems. they even have a product to clean the drain and sensors.