[sonic2]

Originally Posted by bobbecky

I’ve been using TankTechsRV in our black tank for several years now and on their site it says their treatment can stay active in the tank indeninitely. It seems a little pricey at first, but once you are using it, the very small amount used each time makes a small bottle last a long time and in very hot conditions it still works without having to add more treatment.

Agree. We've used both of these products in the gray and black tanks; no smells and our sensors now work. Also, we use the wand a couple times a years to get all the tanks extra clean. View their web site and watch the video's http://tanktechsrx.com/ https://uniquemm.com/