A sump pump sounding like a churning washing machine or gurgling heavily is typically caused by cavitation, air trapped in the pump housing, or water surging backward through an improper check valve. When the pump struggles to prime or air pockets circulate inside the volute, it creates a turbulent, churning sound. Verification: Check that the check valve is installed in the correct direction and drill a tiny 1/8-inch anti-airlock weep hole in the discharge pipe if recommended by the manufacturer.
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