It takes 2

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It takes 2.31 "FEET" to equal 1 psi. If you have a column of water in a pipe that is 23.1 feet tall (or a swimming pool that is 23.1 feet deep), at the bottom, you would have 10 psi. Your pump system does not know the difference. Likewise, if your pump builds 30 psi, that is the same as lifting a column of water 69.3 feet.

Take a look at the 12 GPM chart. IF you lift a column of water 100 feet @ 30 psi (remember, that simply adds another 69.3 feet), your total Head in Feet would equal 169.3. Pretty simple, right? Find about 169.3 feet and trace the line until you cross the line of the pump you want. You will see that the 1/2 HP 12 GPM pump falls perfectly in the recommended range.

What if your water level in your well is less than 100 feet in depth?

This will show you that bigger is not always better! If your well was only 30 feet to water instead of 100 feet, and someone tried to tell you that you needed a 3/4 HP motor, you would see that it would actually be bad for the pump! Bigger is not always better!

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