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Old 10-23-2018, 03:50 PM   #9
Canonman
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Join Date: May 2016
Location: South Jordan, Utah
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"only draining the liquid, not the solid matter unless it is flushed out."

It was explained to me early in our RV life that the secret to properly maintaining the black tank is to treat it like you do the bowl. Lots of water to rinse everything down. In other words you have to flush out the tank.
When we dump the black tank we first fill it with water via the internal tank rinser. If your trailer isn't equipped with this feature then just fill the tank by holding the flush pedal down until the tank is full. When you open the dump valve you'll be flushing the tank just like when you flush the bowl. I usually do this a couple times to be sure the tank is as clean as possible.
Yes, it's a bit of a pain, but the alternative is worse. Even the city has to flush out the sewer system every so often for the same reason. Solids will build up and harden if you don't.
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