For Leveluk models SD501, SD501 Platinum, JRII, Travel R Genuine Enagic Kangen filter manufactured in Enagic Japan Factory Avoid cheaper imitations that leaks causing the filter to burst within the generator, and most importantly, a cheap competitor's filter will invalidate your warranty with Enagic. A high-grade type that comes standard with the LeveLuk series. Removal of chlorine Replacement intervals vary depending on usage and water quality