Always disconnect from the electrical socket before performing maintenance; Always ensure the pump is submersed in water; Do not lift the pump unit by pulling the power cord; The power supply cord provided for this appliance cannot be replaced; A Clogged or dirty intake screen will generally reduce the performance of the pump; Hence , you must wash away the surrounded debris frequently; If less flow is required, adjust the flow control lever; Remove the front cover and the impeller , followed by the impeller unit. Use a small brush to clean the cylinder or just wash away the debris under running water; If the pump fails to operate, check and ensure there is a consistent power supply to the pump unit; Performing regular maintenance can prolong the life span of the pump. During installaton, ensure the power socket is inserted plugged at the higher point; this is to ensure that the water will not back flow via wire to the socket outlet.