My black and gray monitors are opposite! It took a while to figure this out. My black (actually gray on the monitor) almost always shows full even tho I rinse with the wand. Last trip I put ice and Dawn dishwashing liquid in the tank with a little water on the way home and I think it helped some. My monitoring just goes by the mental four-five days on the black. Leave the gray valve open until the day before I empty the black. I will try the Dishwashing pods -that sounds like a good idea.
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