The two main factors to consider when selecting a meter are the flow range and the pipe size. The flow through the pipe must not exceed the capacity of the water meter. However, the meter must still be able to measure at the minimum flow as well. This prevents the use of large meters to measure small flows. For example, if watering is done using a garden hose then the flow will be about 8GPM. If the water meter only measures down to 12 GPM then the flow won't be detected by the meter and the injector will not inject.

Installation restrictions also might affect which meter is most appropriate. Refer to the Meter User Manual for information on which meters require less room or straight pipe sections.

If water is supplied through a municiple water line there is probably a water meter that can be used to help find the flow rate. Simply turn on all the zones or hoses and use the water meter to determine the flow rate. There is usually a description on the meter such as "20 gallons per revolution of the indicator wheel."
GPM=(Gallons of Water)/(Minutes Elapsed)

If water is supplied by a well or pond then the pump's information will be required to find the maximum flow. Most pumps come with either a pump curve or a chart that indicate the maximum flow.

If only hoses are used to water then the general rule of approximately 8GPM per hose can be used to estimate the maximum flow when all the hoses are used at once.

If you would like help selecting a meter, please feel free to call our sales staff for assistance (1-800-331-9620).