After 7 years of full timing, holding tank sensors now WORK!

I used the Flush King for years on our old trailer with great results. Our new trailer has a built in sprayer in the black tank. I'm not convinced the sprayer gets the tank anywheres near as clean as the flush king. Im planning on using both for our new trailer. Might get a hydro flush and separate valve which would accomplish the same thing and is a bit cheaper.