Experiments so far have shown that powder made from spent coffee grounds can rid water of heavy metal ions, which can cause health problems. (sciencedaily.com)
Additionally, when paired with paper - based sensors, CAT could detect heavy metal ions in water, without displacing the indicator ink. (sciencedaily.com)
PF - 2 reduction elements are designed for use in conjunction with Black Berkey water purification elements to adsorb the following unwanted elements found in drinking water - Fluoride, Arsenic V and pre oxidized Arsenic III, Other residual heavy metal ions. (theberkey.com)