Does it matter how the pump is mounted? Does having the impeller facing the floor effect the performance?
I have mine mounted with the impeller face mounted out and the discharge outlet at the top.
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Yup like Phunhog, you want to rotate your pump head 90 degrees so that the inlet is at the bottom and the outlet with a ball valve is on the top. This allows air bubbles to escape from inside the head of the pump.