On Tue, 29 Jun 2010 15:55:33 -0400, Jim Elbrecht
wrote:

If what you have is PVC, the 'building engineer' is nuts. [or every
bottle of bleach would say 'don't use if your drain is PVC] If
there is rubber somewhere he *might* have a point, but I doubt it.

My lawn irrigation is 3/4 PVC. Municipal water has Chlorine. Same with
pool plumbing. They ain't dead yet :-/