My wife and I have found that it takes about 3 to 4 days for us to fill the blackwater tank on our Elkmont with a flush toilet. It is at the dealer now to work on because when I tested it, I could only pour about 9 gallons into it before it filled. I suspect that the toilet pipe and the vent pipe were placed too far down into the tank and created an air pocket which cannot be filled. We'll see what they find.
If you have a flush toilet, you may want to see if you can pour 3 five gallon buckets into it to verify the capacity.
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