Water Purifier Spares-Fontanilla-Filter cartridge To be changed every 6 months Price: £17.25 incVAT IN STOCK NOW. FREE MAINLAND UK DELIVERY IN 2-3 WORKING DAYS. As the water passes through the silver impregnated active carbon filter, all chlorine, odours and tastes are removed leaving pure fresh water for drinking, cooking, baby formula preparation or any other use. The Silver impregnated filter cartridge is to be used with the Fontanilla undercounter water filter.