20 inch flat mouth softened resin filter out facets Cation alternative principle, efficiently replace calcium and magnesium scale ions, soften water advantageous Applicable models: 20-inch clear out bottle and water purification package normal Replacement cycle: 6-8 months Product efficacy: soften water quality, reduce scale/alkali, reduce the chance of stones size:508 x 73mm Material:PP+resin colour:Yellow+white Package Contents: 1 x clear out features Only the above package content, different merchandise should not included. Note: Light taking pictures and diverse reveals may cause the colour of the item within the picture slightly varied from the genuine thing. The measurement allowed error is +/- 1-3cm.