Black Water Tank
It seemed the black water tank filled too quickly with only the two of us, however, after returning from a recent camping trip (see picture) it appears it doesn't fill as quickly as originally thought. In our experience, it will appear to fill too quickly if you don't use plenty of water when flushing (#2).. If you fill the bowl 1/2 full and then flush again 1/2 full it seems to make sure you don't get those false readings...
Anyway, after two days and two nights and not trying to conserve, we only lit two out of four lights on the gauges. Again, we used water and didn't try to be stingy with it. I took two nice hot showers, and didn't hold back on using the water...we started with a full water tank and used half of it according to the gauge.
When we left the campground (the gauges showed two lights each) we dumped what seemed quite a bit, first black then gray... and guess what? The gauges showed both tanks empty after dumping..just like they should.
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