Profile: EarthTrade Water (ETW) is engaged in the fields of water treatment, health and nutrition involved in researching and testing. We offer specialty pre-filters designed to handle virtually any water quality problem, and work directly in concert with your ionizing system. Our commercial ionizers have been specifically designed to operate in high heat and humidity conditions. A full range of specialty pre-filters is in the offering to remove unwanted contaminants in your drinking water before ionization.