The filter used in SureAquaCorp products is a microfiltration/ultrafiltration capillary membrane with a filtration size of 0.2/0.01 microns depending on the products selected, smaller than the smallest water bacteria. The outer case of the straws is made of sturdy PES (Polyethersulfone) and the outer casing of the SureAquaBottle+ is polyethersulfone.
Water is sucked up through the membrane passing into the inner core of the filter straw. Because water molecules are less than 0.2 microns water is able to easily pass through the membrane, however, because bacteria cells are larger than 0.5 microns they are unable to pass through the membrane and are trapped in the body of the filter, resulting in the removal of 99.9999% of bacteria as SureAquaStraw. Parasitic cysts are similarly trapped. A light shake of the filter after use, and a periodic clean leaves the straw clean and reusable for up to 500 liters (132 gallons) of water. The SureAquaStraw+ and SureAquaBottle+ use the filtration level of 0.01 microns therefore capturing bacteria to a level of 99.9999% AND viruses to a level of 99.99% and filtering a volume of upto 1,000 litres (264 gallons).
Filtration occurs immediately as you sip the drinking water up, and the system and mouth piece is designed to be suitable for children as young as 3.
SureAquaCorp products do not use chemicals, carbon or iodine for filtration and is therefore universally safe.