The answer to 'how to maintain sump pump' is to perform regular inspections and maintenance to ensure your sump pump is functioning properly. This includes checking the pump, float switch, and discharge line for any issues and cleaning or replacing components as needed.
It's recommended to test your sump pump every 3-6 months by pouring water into the sump pit to ensure the pump turns on and removes the water effectively. You should also clean the sump pit of any debris that could clog the pump. If you notice any issues with the pump, float switch, or discharge line, it's best to call a professional plumber for repairs.