NO questions are stupid if you are trying to learn. We actually appreciate questions that we've not had before as they help us frame answers for questions others might be thinking of asking. I hope we addresses some of your concerns about backwash. We are reluctant to endorse any backwash use from a water treatment system as this water is probably high in elements you don't want to add to your yard. Please watch our event calendar and join us for one of our Drip Tape classes. We cover more on this process there.