The answer to 'how to maintain sump pump' is to regularly inspect and test your sump pump to ensure it is functioning properly. This includes checking the pump, float switch, and power supply, as well as cleaning the sump pit and removing any debris that could interfere with the pump's operation.
It's recommended to perform a sump pump maintenance check at least twice a year, ideally in the spring and fall. This will help ensure your sump pump is ready to handle heavy rain and melting snow when you need it most. If you notice any issues with your sump pump, it's best to call a professional plumber to diagnose and repair the problem.