Everett wrote:
Hi Peggie (or whomever ...)

What do you think about the idea of using non-pressurized water for a SeaEra
(or whatever) via a "day tank??" I'm considering using the pressure water
to automatically fill a small (2-5 gal) tank, controlled by something like a
toilet regulator. The toilet would draw water from the small tank using its
own pump.

That should be ok for any sea water toilet, provided the plumbing from
the fresh water tank includes both anti-siphon devices and backflow
preventers.

However, IMO a better solution would be a totally separate tank, not
connected to the onboard fresh water supply but with its own fill, that
can be filled with fresh water OR sea water if it becomes necessary to
conserve fresh water.

The simplest solution of all wouldn't require any additional flush water
tank...but only re-routing the head sink discharge hose to tee it into
the head intake hose. To flush with fresh water, close the seacock, fill
the sink with fresh water and flush the toilet. Because the seacock is
closed, the toilet will pull the water out of the sink. You can use this
method only to flush all the sea water out of the system before the boat
sits, or you can keep the seacock closed except when the sink is in use
and use the sink as a flush water "tank" all the time...how practical it
would be to use all the time depends on how accessible the seacock is.
You would need to keep a plug in the sink, or install a conveniently
located shutoff valve in the sink drain line, to flush the toilet with
sea water.

Peggie
----------
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://www.seaworthy.com/html/get_ri...oat_odors.html