Your camping solo, and after 4 nights your black tank sensor is showing full on a 32 gallon tank. Don't think one person could create 32 gallons of waste including flush water in that time. As stated, look down the toilet while flushing.
Just got back from a 6 night trip with DW and 6 year old. My black tank started showing full on the indicator after 5 nights, but I couldn't see it - so didn't dump black until leaving.
Gray water is another story. We will use the CG facilities if clean, and take navy showers if using our TT's shower. We wash dishes and pans, but use paper plates until we run out of them. I had to dump the gray water every other day - use my portable tank and haul it to the dump station with the TV.
