Sobo WP-1880 Aquarium Submersible Pump [ AC 220-240V 50/60Hz 20W H.MAX:1.2M F.MAX:1200L/HR ] PERFORMANCE: – 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., NOTE: – Performing regular maintenance can prolong the life span of the pump. During installation, ensure the power plug of the pump is inserted to the power socket outlet at the higher point. This is to ensure that water will not back flow via the wire to the socket outlet. MAINTENANCE: – Remove the front cover and the impeller cover, followed by the impeller unit. Use a small brush to clean the cylinder or just wash away the debris under running water., REMINDER: – If the pump fails to operate, check the following:- Check and ensure there is a consistent power supply to the pump unit.