If the water sucked in is contaminated by weed killer, fertilizer or pesticides, it can make you very sick or kill you. A mechanical device that acts as a check valve to prevent used water from reentering and potentially contaminating your drinking water. All sprinkler systems must be equipped with a backflow preventer. Before installing a new sprinkler system that will use City water, you must get a permit. The Fort Collins Plumbing Code specifies the types of pipes and materials that must be used upstream of backflow preventers.
Higher flows can damage the meter.
Larger connections may be installed downstream of the assembly. An AVB must be installed on each irrigation zone. No chemical or fertilizer may be introduced into a sprinkler system equipped with AVBs. Only one PVB is required to serve the whole system. No chemical or fertilizer may be introduced into an irrigation system equipped with PVBAs.