This post is not related to my back lawn other post; I am working on two completely different yard projects at the same time.
Main question: I have a simple drip irrigation system to water a row of pampass grass bushes (general view in pix "MostGeneralView.jpg"). Do I need any kind of "filter" or "Backflow" valve at either junction where the regular hose connects to either 1) the timer, or 2) the drip irrigation hose? I illustrate my question in pix "Timer.jpg" and "Connection.jpg"
I am confused on whether "backflow" can reenter my house water pipes and do damage. I am going off hearsay, and apologize if this worry sounds weird, but I want to make sure. Is this even worth worrying about for such a simple drip irrigation system?
My impression is that I do not need filter and backflow valves, since my drip irrigation system is so basic. I have not yet put fertilizer into the bushes since I planted them and they don't seem to need it for now. Nor are there any chemicals that either me or my neighbor use. If I am wrong, however, let me know, and I will obtain whatever part the replies recommend. All the videos I saw on drip irrigation seemed to suggest "filter" and "backflow".