Will ICE Clean out your black water tank...Video
This is a great video that answers the question: https://vimeo.com/107203617 https://vimeo.com/107203617
Forum Discussion
The thing is, holding tanks come in many different configurations and dimensions. Some have a side outlet, some an end outlet and some a bottom outlet.
Some tanks are very easy to dump and flush. Some are the opposite. We've had both and currently have the latter. Our black tank is not very tall below the toilet and builds up a pyramid quickly and we don't always get the full use of the tank. I use the built-in flusher for at least 5 minutes while breaking camp. A few times we've had to use Liquid Drano - our owner's manual says to use it. It won't hurt anything. Used to use a backflush elbow but am finding the tank flusher is enough if used long enough.
I would guess that those that say they don't ever have issues dumping have tank dimensions that are easier to drain.
As for ice - waste of time. The best plan is to add 3-5 gallons in tank before use, use lots of water when flushing and thoroughly flush before leaving the CG. If the pipe drops down vertically below your toilet and you can't see the black bottom (and maybe some droplets of yellow glue), it isn't clean enough. I like to be able to use our level sensors and they won't work with slime stuck to the tank wall.
Some tanks are very easy to dump and flush. Some are the opposite. We've had both and currently have the latter. Our black tank is not very tall below the toilet and builds up a pyramid quickly and we don't always get the full use of the tank. I use the built-in flusher for at least 5 minutes while breaking camp. A few times we've had to use Liquid Drano - our owner's manual says to use it. It won't hurt anything. Used to use a backflush elbow but am finding the tank flusher is enough if used long enough.
I would guess that those that say they don't ever have issues dumping have tank dimensions that are easier to drain.
As for ice - waste of time. The best plan is to add 3-5 gallons in tank before use, use lots of water when flushing and thoroughly flush before leaving the CG. If the pipe drops down vertically below your toilet and you can't see the black bottom (and maybe some droplets of yellow glue), it isn't clean enough. I like to be able to use our level sensors and they won't work with slime stuck to the tank wall.
