Quote:
Originally Posted by Pete'sMH
Sort of off thread here but I have been wondering why there is even a separate tank for grey water. Can anyone tell me why they don’t just use one big tank for waste water and dump everything into it? It would be simpler and even cheaper and you’d never have to worry about having enough water in the black tank. It’s a real question.
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Physically, it’s easier to find space for two small tanks, and also easier to support them due to smaller size and lower weight.
Functionally, it’s advantageous to be able to dump the black first and then follow with relatively cleaner grey water in order to rinse out the hose with “less dirty” waste water.
Having said that, use of macerator pumps changes the functional advantage mentioned above, so a single large tank can be practical if supported properly.
I recall seeing specs for a million dollar luxury motorhome that had a single 200-gallon waste tank. At other extreme there are Class Bs with a single small tank, but if I recall correctly, they had a macerator pump also.
I suppose that even without a pump (gravity dump only), a rinse system can be added to help clear hose of solid waste after dumping; prior to final rinse.
There is usually not just one right way to do most things.
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