On Mon, 14 Feb 2011 15:45:11 -0500, "Noel" wrote:

I'd take a serious look at wasting anymore of your time, in an attempt to
kill a tree pouring brine water down a sewer.

The OP is not trying to kill the tree, only keep to sewer pipe roots
at bay.

The discharge from my water softener after re-generation will kill the
grass, plants, etc. The discharge line goes into our public sewer
lines, because of it.