This is the best tank treatment we’ve ever had and we’ve been Rving since 2018. Our sensors were always reading full no matter how many times we flushed our black tank. After a summer of camping, dumping tanks, and more camping our sensors are reading “Empty” on our blank tank. I know we probably shouldn’t have but I may have added a little to our gray tank. But now we’ll give the gray tank cleaner a try on our next trip in October. We’re a customer for life with Liquified now!