With 3.575 million people dying each year from water-related disease, our current water crisis is one of epic proportions. At any given time, half of the world's hospital beds are occupied by those suffering from illness brought on by limited access to safe drinking water, poor hygiene and sanitation. This is why these examples of devices used to purify drinking water are so critical to help the developing world.

This explains how ammonia can be filtered out of water and what materials can be used to do so.

The European Commission (EC) asked the European Food Safety Authority (EFSA) for scientific assistance regarding the possible impact on human health of exposure to ammonium released from water filter cartridges. This explains what ammonia is and how it can hurt people through exposure.

This gives information regarding what turbidity is and how it can be filtered out of water.

Source water may contain turbidity (muddiness), particles, and organic material. Federal and state laws require all surface water systems and systems under the influence of surface water to filter their water. The primary water treatment technology uses filtration techniques. Filtration is the removal of particulates, and thus some contaminants, by water flowing through a porous medium.