Now if you had said you built the fire systems and subcontracted the building I might be able to ask you, who the heck out there services the fire sprinkler system that was installed in my single family residence home.
Seems there is just not enough business out there to justify a guy with a route to keep the system in order.
Every once in a while a house low pressure bell will ring just for a bit. I figure it is low water pressure in the neighborhood during peak usage.
Have no idea, I never built or worked on shacks.