Art_xyz
The reason galvanized water piping is one size larger than copper piping IS NOT because they are anticipating rust build-up, but is because the interior walls are much rougher than copper pipe (check your flow charts).
As for the pump installed on the water service: Is anyone aware that a lawn sprinkler system is considered a HIGH HAZARD and needs to be isolated from all other water piping with a backpreasure/backflow prevention assembly to prevent contamination of the drinking water supply?
