The Urspring filters water through pores that are so small that all bacteria, parasites, other microorganisms and even 99.99% of all viruses are removed. Minerals remain in the water. The retained substances are automatically flushed into the wastewater regularly, usually once a day. The pressure required for filtration is extremely low: in a household with one family, there is usually no noticeable drop in pressure at the tapping point after installing an Urspring. The original technology comes from medicine: there the filters are used in dialysis to purify blood.