A backflow preventer is a device that prevents unwanted reversals of flow of water or other liquids that could cause harm to people, cause a bad taste, or discolor drinking water. Backflow preventers, known to plumbing and irrigation professionals as backflow prevention assemblies, are required on all landscape irrigation systems and all automatic refill lines for swimming pools, fountains and garden ponds. All irrigation backflow preventers must be tested every 5 years, as well as upon installation or after servicing.
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