SPRINKLER TALK FORUM - You Got Questions, We've Got Answers

Our "new to us" house has an existing irrigation system that is damaging the bark on the trees by years of spraying the same place. I have adjusted the spray head to diffuse the spray as much as possible, but would like to replace with heads that would cause less damage. I can't disengage the system because it is linked to the septic tank filtering system and goes off automatically. Any suggestions would be appreciated.