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The variable speed motor has permanent magnets, which 2 speed pump motors do not. The magnet make the motor run cooler, thus longer life, and the magnets make the motor more efficient. A pump is 30% more efficient than the same horsepower motor. The variable speed is not hard to understand, if...

I have a friend who wants me to help with his pool/spa plumbing. I am having trouble figuring out, one thing. He is switching from 2 pumps to 1 pump for a spa/pool combo. The spa has a higher water level. A check valve on the spa return line would stop the water from draining back, when the spa...