Aquasana under-counter replacement filter set To be changed every 6 months Price: £28.75 incVAT The first filter removes sediment and suspended particles from the water. The water, under mains pressure, is then passed through an two active carbon filters that eliminate chlorine. Unit removes removes 99% of micro organisms, including bacteria and viruses. To be used with the Aquasana under-counter drinking water purifier IN STOCK NOW. FREE MAINLAND UK DELIVERY IN 2-3 WORKING DAYS.