The Cobalt Duo-Filter UV 500 and 1000 include a USB powered UV steriliser with germicidal grade LEDs. Four LEDs blast the pumps impeller chamber with 500mW of ultraviolet rays before the water exits through a horizontally adjustable venturi nozzle. The round LED housing of the Cobalt Duofilter UV is a translucent purple, so that you can verify the UV is in working order. It is easy to unscrew and clean when required(an important feature to have for any UV sterilizer). The USB power supply is also separate from the pump cord. The UV 500 is rated for 30-gallons. The UV 1000 is rated for 55 gallons.
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