Roger Long wrote:
This business about not connecting FW systems to sanitary plumbing
reminds me of a USPH required and approved arrangment for FW flushing
systems.

What is USPH???

It's called an "Air Gap" and is basically just a funnel with a pipe
outlet a few inches above it. The funnel goes to the tank for fresh
flush water. The valve can either be manual or perhaps controlled by a
float in the flush water tank. If something goes wrong with the
sanitary system, the water just backs up and overflows the funnel with
no way to get into the potable water.

???? I can't see how that would work in any marine sanition system.

--
Peggie
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Peggie Hall
Specializing in marine sanitation since 1987
Author "Get Rid of Boat Odors - A Guide To Marine Sanitation Systems and
Other Sources of Aggravation and Odor"
http://shop.sailboatowners.com/books...ku=90&cat=1304