Dave Smith > wrote:

>I am on a well and cistern. The problem was in a drain, so it has
>nothing to do with the the feed lines.

In my experience drain pipes fail more often then feed pipes. Not
sure why, but it might be the inside of the pipe is more prone to
alternate exposure to water and air and that this promotes corrosion.
I've often seen a drain pipe corroded clear through, but not feed pipes.

Steve