water filtering high or low pump speed

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  • Last Post 17 August 2021
level85 posted this 17 August 2021

Hello,

I have a 150-lb Hayward sand filter with brand-new sand, a dual speed jacuzzi pump (220V single phase, GE motor, rated 2-1/4 HP). This pump motor has two operation modes, a high-speed and a low-speed mode. When it is run in low-speed, the pressure drop across the sand filter is 2 psi. When the pump is run in high-speed, the pressure drop across the sand filter is 15 psi.  

My question is, is the water being filtered if I run the motor in low-speed mode? is the filtering any better if I run the pump in high-speed mode? I like low-speed since its quieter. I am concerned that 2 psi pressure drop across the sand filter is such as small amount that I think water isn't really being filtered. Please share your advice.

InyoRob posted this 17 August 2021

The water is still being filtered at the low speed. In fact, it does a better job at filtering at lower speeds than at high speeds.

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