We have a well only, no city water... the water for the house goes through a softener system. The irrigation water does not. We aim the sprinklers as best as possible, but it is heavy rust so even trees get stained. What I'm not sure about is whether one of those rust removal systems for irrigation could be used, or does that only work when the well is exclusively for irrigation? They show them hooking up at the well... not sure exactly how this would work in our case... would it maybe hook up somewhere else along the path so that the additive laced irrigation water does not backflow? cpa accountant here... thanks!