I was thinking about my new irrigation system that was installed and thought of a question that i'd pose to you experts. I have Hunter I-20's throughout my yard. Is there is big different in the types of nozzles that you can put in? In other words, i have some heads that arc at 90 degrees, some at 180 & some at 360 (within the same zones). It seems like they all rotate at the same speed and "seems" like they spray all the same, but i can't really tell and my contractor didn't indicate that he installed different nozzles within a zone. All the nozzles are blue that i can see. Are there different nozzles and how can you tell (other than looking at the spray) that they actually spray different? Do you suggest that i change the nozzles based on the arcs within a zone? Your suggestions and expertise are appreciated.