I've got too much to do for a long one finger typed explanation of all this so I'll just post pics. The most interesting thing for a dinky pipe person like me is the controller room. Notice the lone pigtail? We installed that. I'm going to introduce the Arboretum to remotes. The pressure on this job is 117psi and no Mike it's not for sale. They have a mixing system for maintaining the acidity in the soil for all the azaleas and acid loving plants.