Profile: Topline Electronics Ltd deals with automated filtration systems, LED underwater light units, and safety equipment & water testing. We offer first class training and advice in all aspects of pool water operating conditions. Underwater lighting in swimming pools and spas is now able to take advantage of recent advances in light emitting diode technology. Swimming pool circulation pumps use a considerable amount of energy, this energy can be reduced by installing an inverter which will control the speed of the circulation pumps.