For a highly reliable UVC we only suggest the Aqua UV, Emperor Aquatics, Laguna, Supreme or Tetra GreenFree Units.
The best UVC available is the Oase Bitron C series. Unique features that make this unit our #1 choice include:
an integrated bypass valve that allows for the use of very high flow through the unit, while allowing simple adjustment to maintain proper water flow past the UV bulb
an automatic cleaning system that is continuously powered by the water flow around the quartz sleeve, thus preventing settling of sludge and slime, allowing maximum UV effectiveness
an integrated permenant magnet prevents calcium deposits ensuring the unit will function for long periods of time without maintenance
For guaranteed continuous crystal clear water there is no better solution than an ultraviolet sterilizer.