Thanks for your idea, Amiga. I always appreciate the help from fellow duckers! I sure wish I had enough space to put a wet garden down hill, but we live in a residential neighborhood with not a whole lit of space to work with.
My thoughts on the limestone came from something I read online and that I use to use the lime powder in our graveled dog run. We use to let the dogs run around our grassed backyard, while we powdered up their run and hosed it in before we put them back in for the night. It seemed to work then but they weren't dabblers. :0) Of course this was in a totally different house that had a bit more space.
So what we were thinking is, dig a trench from one end of the duck area, to the other end of a backyard where a tree and rose bushes are, place the Lime or Limestone in the trench, cover that with the round stone pea gravel. We would dig it just deep enough to cause a downward environment, directing it towards a larger, deeper end. Of course taking care not to destroy the roots of the tree and roses.