Step 5 - Determine Gallons Per Minute
- Take the time in seconds it took to fill the one gallon container and divide that into 60 seconds to get the number of gallons it pumped per minute.
- Our powerhead example: 60 seconds divided into 15 seconds = 4 gallons per minute.
- Now multiply the number of gallons per minute by 60 minutes and you get the number of gallons per hour pumped.
- Our powerhead example: 60 minutes multiplied by 4 gallons = 240 GPH (gallons per hour).
Step 7 - Determine How Many Times Per Hour the Tank Water Volume is Turned Over
Divide the number of gallons per hour by the actual gallons of tank water volume you got from Step 2.
- Our powerhead example: 240 GPH (gallons per hour) divided into 38 gallons = 6.32 times per hour our tank water passes through the powerhead.
- Example: You are looking at a water pump that is rated at 400 GPH. You have a total of 55 gallons of actual tank water. This water pump will turn over the tank water 7.27 times per hour. Estimate in any factors for resistance and decide if this pump is going to be sufficient for your needs.
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