0.9 Micron Ceramic Cartridge with KDF, CaSO3, BIO Ceramic Balls, Fiber Carbon. It completely removes dust, rust, cyst, particles, contaminants as small as 0.9 micron. The Bio ceramic balls, combined with natural healthy pH beads emit natural minerals that enrich calcium, magnesium, potassium, sodium and balance the pH level of the water, which makes for a crisp and refreshing taste.