The ultrafiltration module use thousands of ultrafiltration hollow fibre membrane strands. Each membrane strand contains billions of microscopic pores. Household water pressure pushes water molecules through these pores towards the hollow centre of the membrane. The membrane filtration provides 99.9999% reduction of bacteria and 99.99% of virus by mechanical means. Filtered water then flows through each fibre and is distributed to the tap or faucet. Ultrafiltration systems are much more water efficient than Ro systems and do not produce acidic water, as is the case with RO water.