UV fliters incorporate UV purification as well as sediment and carbon filtration. This provides the ultimate in filtration for the home. The twin under-sink models offer flow rates to 2.5 Lpm . Larger models eg the Terminator 25 offer filtration flows to 25 Lpm. which enables them to service multiple taps where high water quality is required. For maximum operation filters need to be replaced regularly and UV lights should be replaced every 12 months.