The Orku Cartridge Replacement Water Filter for Hydro Tap is leading the way in innovative water filtering technology. All Orku water filters are engineered to remove chlorine and other water contaminants without removing all the beneficial minerals. Coconut shell activated carbon block assists in removing chlorine and eliminates bad odours whilst improving water taste. Also, the silicon-phosphorus crystal works to reduce scale. Drink the purest, healthiest water every time with peace of mind. Orku water filter cartridges have no expiry.