
Okay I thought I cleaned the black tank in my Lance RV well. I have one of those hose sticks that I attach to the toilet that sprays in a 360 degree circle. I have a drain spout that sprays water back into the tank as I drain the water and I always let it run until the water runs clear. Despite all this, my black meter never showed empty. I understand it's a bad sensor. I decided to give it a try. I needed 2 treatments and many "washes" of the aquarium. This material displaces material that must have been here for years. The bottom line is that the gauge on my black tank is blank for the first time in 8 years!

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