The Black Berkey Purification Elements used will remove all parasites, cysts, pathogenic bacteria and even viruses. In addition, it will extract harmful chemicals such as herbicides, pesticides, VOCs, organic solvents, radon 222 and trihalomethanes. It also reduces rust, silt, sediment, foul taste and odours and unhealthy minerals such as lead and mercury. This system is so powerful it can remove red food coloring from water. All this is achieved without removing the minerals that are beneficial to your body. No other system can duplicate this performance.