Follow our guide on measuring flow and then select your flow the following page:
Measuring flow is just as important as pressure. Flow is the volume of water moving in the pipe over a certain amount of time (measured in Gallons Per Minute [GPM]). A flow meter can be purchased and ran with your system, though not required.
To measure your flow, bring a 5-gallon bucket to the water source. Place bucket underneath the faucet and turn on the water (avoid frost freeze faucets).
Record the time it takes to fill up the bucket. If you can fill the bucket in under 45 seconds, then you have the recommended amount of flow.
Follow along to us in this video below!