The versatile Imperial Berkey™ system is the ideal system for use with small to medium sized groups, at home, churches, hospitals orphanages, for outdoor activities or during unexpected emergencies.The Imperial Berkey™ system removes viruses, pathogenic bacteria, cysts and parasites and extracts harmful chemicals such as herbicides, pesticides, VOCs, organic solvents, radon 222 and trihalomethanes. It also reduces rust, silt, sediment, foul taste and odors and unhealthy minerals such as lead and mercury. This system is so powerful it can remove red food coloring from water without removing the beneficial minerals your body needs. Virtually no other system can duplicate this performance.