I recently built a new home that contains a tank room pretty much in the center. I had the builder run a PVC pipe through the wall from the tank room all the way to the outside. My intent was that the waste water would flow outside and topoff the swimming pool. Unfortunately, when we finally selected a pool installer, they claim that the RO/DI waste water will mess up the pool's water chemistry. In my previous home, I always saved the waste water in a large trash can and carried it outside in 5-gal buckets, and into the pool it went, with no ill consequences that I was ever aware of. So now I have this PVC pipe sticking out of the back of my house and a pool installer who is not willing to use the water. I guess I can direct it to the flower beds, but if anyone knows of any solid evidence that can help, I would really prefer to put the water in the pool.