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Old 18-09-2011, 15:06   #1
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Blackwater / Graywater - Best System ?

New project, 2 heads, 2 showers, 3 sinks. All direct overboard currently. Do I want to? A- 2 heads to 1 black tank. 3 sinks + 2 showers to 1 grey tank. B- All to 1 tank. C- forward head, sink,shower to #1 tank. + galley sink to #2 tank + aft head, sink, shower to # 3 tank. D- Your opinions PLEASE.
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Old 18-09-2011, 16:11   #2
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Re: Blackwater/Greywater best system?

Combining gray and black water in the same tank violates USCG's illegal even for the two systems to share ANY common plumbing, including vents. So that option is out.

However, it IS legal to send gray water directly overboard and I strongly recommend you continue to do so, 'cuz managing a gray water tank (dealing with sludge and preventing odor) is a LOT more difficult than managing a black water tank. A sump is the closest thing to a gray water tank you'd want.

How many black water tanks you'd need depends on how far apart the toilets that the tank be not much more than about 6' from a toilet 'cuz 6' is about as far as bowl contents can move in the amount of time anyone will spend pumping a toilet or leave their finger on a flush button. That's not cast in concrete...there can often be work arounds in the plumbing that provide an assist from gravity to get the flush all the way to the tank.
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