Advantages of a single tank - well, just one tank to worry about etc. The gray water helps keep solids from the toilet from settling and forming a blockage in your tank. A lot of RVers are very sparing about using plenty of water in their black tank, wanting to stretch the times between dumping. This can lead to LOTS of troubles. Disadvantages - you have to dump more often, which can be a hassle. Advantages of two tanks, one for gray water & one for black - you can stretch your time between dumping.
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Sean
If Ain't a Newell, It Ain't Wurt Oonin!
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