There have been many reviews for this device but I wanted to add at least one more. This tank washer works. First I bought it for my camper which has no external connections. All in a wet bay. I had to remove the six inch clear connection and put rinse aid in its place. I had to fiddle with it a bit because of the tight fit. After everything was connected, I gave it a try. He opened the black tank valve and closed the other two. He started the water and followed everything carefully, he didn't want trouble in the car. It took ten minutes to fill the black tank to the bottom. I turned off the water and turned on the faucet. At first the water flowing from the tank was clear, then it turned dark brown with all sorts of debris. I did this three more times, and as a result, sensors that hadn't worked for months began to work, not perfectly, but with improvement. More importantly, the built-in black tank flush, which hadn't worked at all for months, worked again, not perfectly, but improved. Did the same thing today, flushed the tank 3 times with even better results. In other words, it's not magic, but it works well as advertised.
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