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.01 Micron Ultra BioStone: This is an upgrade filter which can be used in all three IonWays ionizers. The unparalleled Ultra BioStone incorporates hollow membrane technology. It is the only ionizer filter on the market that removes all water borne viral and bacterial contaminants. It also incorporates anti-microbial GAC, calcium and Tourmaline. For optimum performance, we recommend this filter be replaced when your ionizer's digital filter life indicator reads 4999.