How to Choose a Pump

How to Choose a Pump

Pumps are designed to move water and are rated according to the number of gallons per hour (GPH) that they move. The measurements indicated i.e. GPH @ 1 ft, GPH @ 3 ft, ... represent the verticle distance from the pump to the discharge point i.e. waterfall or filter. To determine the right pump for you, consider the following:

1. The specified application for the pump.

  • A. Filter: Check specified filter flow rates in terms of GPH.
  • B. Waterfall: Each 100 GPH at the discharge point produces 1/2" deep flow 1" wide or 1/4" deep flow 2", or a trickle at 4" wide. The width of the flow is determined by the liner or cascade point in the waterfall.
  • C. Fountain or statuary: Check specified flow rates for the specific fountain or statuary piece.

    2. Pond volume of water.

    To determine total gallons, multiply in feet the length x width x depth x 7.5. GPH at the discharge point usually should not exceed the total of gallons of water in pond. (i.e. Do not recirculate entire pond volume more than once an hour.)

    3. The verticle lift

    The verticle and/or horizontal distance from the pump to the discharge point is used to determine the verticle lift. The vertical distance is the number of feet measured vertically from the pump to the discharge point. The horizontal distance is simply the number of feet measured horizontally from the pump to the discharge point. Since horizontal distance has far less of an impact on the flow rate than vertical distance, it takes ten horizontal feet to equal the effect of one vertical foot of distance. Horizontal distances less than ten feet are generally not a factor. For example, a pump that has a discharge point three feet away vertically and twenty feet away horizontally, has a total vertical lift of five feet. Another example is a pump that has a discharge point that is vertically three feet away and horizontally five feet away, the total vertical lift is three feet. Vertical lift rates are listed in the details of all the Pumps sold within our web-site.