Water Pitcher Refillable Replacement Filter Mg2+ by BWT (3) Enhances the taste and quality of drinking water by removing chlorine, copper, lead, mercury and pesticides, as well as limescale that damages kitchen appliances. Fits Brita and other popular water filter pitchers. Made by Europe's No. 1 water technology company, BWT water filter cartridges can be reused. Innovative and unique: Mg2+ technology adds valuable magnesium to the filtered water. Environmentally friendly: filter cartridges can be refilled thereby contributing to waste reduction and cost savings  no more water bottles many of which end up in landfills. Convenient and economical: no need to carry water bottles any longer.