SNIP

But when it comes to how to plumb a system or what materials to
use, there is nothing--at least nothing specific to sanitaion. There
is
a standard advising vented loops in all hoses connected to
below-waterline thru-hulls and advice to keep all seacocks closed
except
when in use, but that's it. When it comes to what hoses and tank
materials and how to plumb 'em, there's only collective wisdom.
--
Peggie


Then, is the collective wisdom that the PVC hose should not be used?
The reason I ask is because the PVC hose seems very solid--even more
so than the rubber hose I took out. The potential problem I saw is
that the PVC cuts rather easily and because of this might be more
vulnerable to accidental damage that could allow sea water into the
boat if one forgot to close the seacock.

Thanks for your very cogent and succinct answer. Peggy, you are the
guardian angel of marine sanitation.

Joe