Evan,
Thanks for the info. I also think 1/4" is too shallow, but I did not know
the recommended gradient. I will have to measure, but I think I can make 1"
per foot of run work.
Steve

"Evan Gatehouse2" wrote in message
...
Steve Lusardi wrote:
Does anyone know what the mimimum slope of this drain can be that will
not cause clogging? I really do not want to use a second grey water tank
in the forward end which will cause loss of space and another through
hull fitting. It is preferable to use one large tank for the whole boat.
Steve

In land based applications it's 1/4" per 12" of run.

Boats are entirely different because they can have a permanent heel or
trim. So I'd allow 1" per 12" on a small boat.

Evan Gatehouse