My apologies, D.L. for encroaching on your post. Every now and then my computer won't let me post a new message but will let me respond - finicky.
We have the whole downstairs gutted now and I can see 3 different kinds of pipes going up to the bathroom - a massive cast iron thing, lead, and PVC. I know the lead's got to be replaced, but isn't cast iron a good thing? Should we keep it or replace all of it with PVC?