I am sort of on the fence. It does not seem to control the odor. We live aboard our voat, the holding tank (20 gallon) gets pumped thoroughly every week. Yet we always have odor. The hoses have been replaced and that did not help. It's a very thick, viscuous liquid, blue, resists being mixed with water a little. Sort of the consistency of honey before diluting. If I could find something that actually killed the odor I would be a happy, happy girl.