Quote:
Originally Posted by gator67
...Does anyone have a clever way of determining how full the black and gray tanks are?
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With our black tank, I can take a flashlight and look down the toilet to see how full the tank below is. This doesn't work for some RVs because there is an angled section of pipe between the toilet and the tank, so you can't get a direct view into the tank.
Most people say the gray tank starts backing up into the shower when the tank is too full. You could try deliberately filling the gray tank with clear water to see what happens. A word of caution, however - our gray tank overflows into a storage bay when it gets too full. Apparently, the seal around the pipe where it enters our gray tank isn't tight.