The pool pump’s basic function is to circulate the water in a swimming pool. Choosing the right pool pump for in-ground swimming pool is important in maintaining your investment.
Pumps prevent water from becoming stagnant, where algae and other bacteria can grow. In choosing the correct pool pump, there are two important figures to consider: the pump flow rate and the pump pressure.
Pump Flow Rate
The pump flow rate is defined in gallons per minute or “gpm”. For the average pool, all of the water should be circulated each day. Write down the volume of your pool. Let’s say your pool is 7500 gallon capacity. Determine how often you wish the water to circulate.
As an example, we’ll say that the water should circulate every five hours. Divide the capacity (7500) by the amount of hours (5). Divide this number by sixty, the amount of minutes in an hour, to determine your flow rate. In this example, the flow rate is 25 gpm.
Next, determine the pump pressure, or the amount of resistance to the flow of water. Write down the amount of feet between the pool pump and the return, or the area where the water flows back into the pool. If you have a filter in your pool, divide the number in half, as the filter helps ease water flow. From here, many factors can increase the head pressure figure.
For example, each 90 degree turn will add two feet. If your pipe goes from being a 1-inch diameter to a 3/4-inch diameter, there is a 25% difference in the amount of pipe. Take the amount of pipe that is affected by the change and multiply by the percentage of change. If you have a 25% change for 4 feet, your figure would be one foot.
If you have any inline filters, they can add anywhere from two to ten feet to the head pressure. Filters using coarser materials should be estimated on the higher side. If your pool’s water return is under water, add the number of feet of depth to your estimation. You have determined your head pressure number and are ready to choose a pump.
Choosing a Pump
Choose a pump which will work specifically for your pool. Some people make the mistake of thinking that they should over estimate, but this only leads to higher energy bills and money wasted. Ask the sales help for advice with respect to your pool material. This will pinpoint the best pool pump candidates.
Knowing your figures and asking informed questions will insure that you select the perfect pump, insuring a stress-free swimming season. Making an educated decision in choosing the right concrete plunge pool pump will save you a lot of money in the long run.