Also you may need to do the flush with the black tank flush system they have installed on it. If applicable.....
Our 1 year old new to us Fuzion has the flush system. And the front black tank always showed full. Every other tank drain, I do the flush system. It gets us down to 1/3 on the indicator for front and will help the rear black tank and we'll go full empty.
I also started doing the GEO Method. Google it.
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