Swimming pools have become household luxury and a vital part of the new generation. Homeowners are concerned to hook up that pump which meets out the specific needs of the swimming pool. The old pumps used force of gravity to propel water to filter but that method was not so efficient. Now the engineers have designed pressurized pump system, it proved more effectiveness. Although the selection of the **best pool pump** is a little bit difficult task, but it becomes easy to understand if someone gets familiar with relative key terms, matches the required strengths with manufacturer’s specifications then one makes the whole task of selection easy.

**How to Calculate the Storage Capacity for Selecting Right Pool Pumps:**

You have first to work out with how many gallons your swimming pool gets filled. The mathematical formulas to calculate gallons are dependent upon the shape of the swimming pools.

**Rectangular Shaped Pools**

To calculate storage capacity of rectangular pools you will calculate average depth, width and length of the pool. The formula would be as under

Number of Gallons = Average Depth X Width X Length X 7.5

To calculate average depth we divide by 2 to the sum of minimum depth and maximum depth. Suppose if you have a pool with width as 20 feet, length as 40 feet and its depth is minimum 4 feet and maximum 8 feet then average depth will be calculated by as 4+8= 12/2 i.e. 6 feet. The storage capacity of the pool will come out to be equal to 36,000 gallons

Total Storage Capacity= (6 ft. X 20 ft. X 40ft.X7.5) =36,000 Gallons

**Circular Shaped Pools**

The calculation of number of gallons in case of circular pools would be as under:

Number of Gallons =Average Depth (Maximum Depth + Minimum Depth)/2 X Diameter of Circle X Diameter of Circle X 5.9

If a pool is having a diameter of 30 feet, depths are same as calculated above i.e. 6 feet (average)

Total Storage Capacity =6X30X30X5.9=31,860 Gallons

**Oval Shaped Pools**

In oval pools there will be 2 diameters, long and short. The formula would be as under:

Number of Gallons =Average Depth (Maximum Depth + Minimum Depth)/2 X Long Diameter X Short Diameter X 6.7 Suppose if a pool is having a long diameter of 30 feet and short diameter of 20 feet depths are same as calculated above i.e. 6 feet(average).Gallons will be determined as under:

Total Storage Capacity =6X30X20X6.7=24,120 Gallons

**Kidney Shaped Pools**

In kidney shaped swimming pools there would be one length and 2 widths, longest width and shortest width, these both widths will be added together, the formula would be as under:

Number of Gallons =Average Depth(Maximum Depth + Minimum Depth)/2 X Length X (Longest width + Shortest Width) X 3.38 Suppose if a pool is having a length of 30 feet, longest width as 20 feet and shortest width as 10 feet, average depth is 6 feet as calculated above then

Total Storage Capacity =6X30X (20+10) X3.38=18,252 Gallons

**Flow Rate: **After calculating the total storage capacity in gallons the other necessary ingredient would be to work out flow rate which means that how many gallons per hour will be required to clean the entire water stored in the swimming pool in 8 hours. To calculate these figures, total storage capacity as worked out above will be divided by 8. For example in case of rectangular shaped swimming pool this figure will be calculated as under:

Flow rate=36,000/8= 4,500 **GPH** (Gallons per hour). Some manufacturing concerns give their specifications in GPM i.e. gallons per minute, it is to simply divide the last figure with 60. In our current consideration, it would be 4500/60=75 **GPM** (Gallons per minute)

**Feet of Head:** The last step would be to measure the feet of head. For example in case of rectangular shaped pool, If you have 3 skimmers and one main drain then you will total up the lengths of the pipes from swimming pool ends to pool pump. After adding the lengths of 4 pipes, we will divide it 4 to calculate average.

If the lengths of the skimmer pipes are 65, 55, and 45 feet and length of drain pipe is 35 feet respectively then total length would come out to be 65+55+45+35=200 feet and we will divide it by 4 to get average** feet of head,** in our case, it would 50 feet.

**How to Buy the Pool Pump with Above Buying Guidelines: ** We have calculated the required figures in case of rectangular shaped swimming pool that are as under:

Flow rate = 75 GPM

Head Feet = 50 Feet

You will match these figures with manufactures manual and pick up the adequate pool pump for you. In selecting the pump some cushion should necessary be provided for safety measures meaning to say that a pump with some higher horse power should be purchased to avoid its burning? Moreover the manufacturing quality of the pool pump also matters.

**Summing it up,** it can be concluded that with a simple mathematical calculations and a slight mental task how one can easily reach to one’s requirements and manages electricity expenses as well.