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A sprinkler and irrigation system that has a chemical feed requires this device. It is also commonly used in commercial establishments to protect against numerous contaminants. These devices must be installed above ground.
For instance, sprinkler and irrigation systems are required to be protected by these devices. They are normally installed near the meter in an underground box.
If the hazard (substance you are protecting against) is considered a high hazard (i.e., a hazard that can cause health problems), the State requires that the device be tested twice a year.
If the hazard is considered a low hazard (such as the hazard effects only the taste and odor of the water), the State requires testing once a year.