[Brad Townsend]

After settling in our summer spot I went to dump the holding tank which should have had been around 3/4 full as the fresh was around 1/4 full. All I got was a little less than 1/4. I looked at the sight glass in the bay before dumping and it showed about that, less than 1/4. I thought maybe it was clogged so connected the hose and back flushed the sight glass and it still showed the same. The fresh water tank was topped off and both dump valves were closed and capped. When I run water in the black tank I could hear what sounded like an empty tank.
This is a mystery. I don't believe it is clogged because what was in there came out ok.
Anyone ever experience such a thing?

Brad