How to Measure the Pressure of the Pump

A pump can be used in a saltwater aquarium in order to keep water clean and air flowing through the system. In order to determine the type of pump you require, you must first measure the pressure of the system's return line and the flow rate of the water in the tank. These calculations will give you the information needed to choose the right pump by looking at the flow chart the manufacturer has presented.

Things You'll Need

  • Tape measure
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Instructions

    • 1

      Measure the distance between the return pump and the level of the return outlets in the tank. Use a ruler or measuring tape to measure this distance.

    • 2

      Measure using a ruler or a tape measure the length of all the horizontal plumbing to the lift.

    • 3

      Add 1.5 feet for every 90 degree turn in the tank. If the return line diameter is small, add up to 2 feet, and if the return line is large, add as little as 1 foot. This will give you the calculated resistance.

    • 4

      Calculate the back pressure by adding a foot for each return that is no more than several inches deep. These open system returns will normally be mounted at the top of the tank to avoid flooding if a power outage occurs.

    • 5

      Add all of the numbers together. This will give you the amount of pressure the return pump will be up against.

    • 6

      Determine the flow rate by multiplying the system volume by the number of times the system will be completely turned over per hour. This is the flow rate of the system in GPH (gallons per hour).