How to accurately measure pump flow
for a residential water well system

Guesswork is not the solution! Pipe size is not the solution.

Use the LAKOS Bucket Test to get the right gpm and the right separator.

  1. Open a valve downstream of pressure tank to drain water from system until well pump turns on

  2. Allow pump to re-fill system completely until pump turns off; system is now at maximum capacity

  3. With no other open flow of water from the system, take a 5-gallon bucket and measure the volume of water removed from the system until pump turns on again

  4. Count the time it takes (in minutes) for the pump to replenish that volume of water

  5. Divide the total water volume (in gallons) by the time (in minutes) to obtain actual gallons per minute (gpm)