The combined total capacity of both the gray and holding tanks is not big enough to hold all the fresh water should you try to go through it all before getting to someplace to dump. The TDF is additional volume that you loose in the holding tank by virtue of what you deposit in the toilet, TURD DISPLACEMENT FACTOR
All kidding aside, I actually really like the extra fresh water capicity and it is never a problem to find an acceptible place to drop gray water, to recapture holding capacity, if need be.
I called the number in the add and she called me back in about 5 min. Did you try to phone her?
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