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Nanoquelle is a portable water-filtration device. It ultilizes nano-ceramic filter. The diameter of the pores in the ceramic can close to 30nm or less, pathogenic microorganisms in the contaminated water could be filtered out. The ceramic filter core can be refreshed at high temperatures and reused permanently. Through ionic conductive sensor which is installed in Nanoquelle, user can obtain the filtered water quality in an instant. Twist the bottom of Nanoquelle, water in the lower container will be slowly pressed through nano-ceramic filter, slowly flow into the transparent upper-container, as if this water is welling up from a spring!