"Bill Watson" wrote in message
...
Does anyone know what the material is that builds up in the sewage lines
(with salt water flushing) on a boat? It is a whitish-grey crust or scale
which seems to build up surprisingly fast.

Is there any easy way to remove, or prevent it?


I've never had any such problem. Never even seen what you're talking about.
Over the years I've used several different buckets made out of rubber,
plastic, wood and even metal and none of them every got a white crusty
build-up. Skid marks, yes. Build up, no! Skid marks are easy to get rid of.
Just fill the bucket with seawater and add some bleach. Let it sit until
next needed. It makes it spic and span and sweet smelling.

So to prevent build up stop using built-in heads and sewage lines. That's
for lubbers. Go back to the efficient and tried and true method of
discretely disposing your waste over the side using a bucket.

--
Gregory Hall
(Peggie's older brother)