... ,different delivery heads 3,adjustable flow controller aquarium pump HL-4501,with finger light, LED lights, ... not use with water above 35C (95F).6, Operate pump completely submerged for proper cooling.7, Not ... pump discharge and tubing for kinks and obstructions. Algae build up can be flushed out with a garden hose.6 ... , Check the inlet to ensure it is not clogged with debris.7, Remove the pump ...