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Photo: Flickr, CC Researchers in Vietnam have recently completed tests on a new way to remove heavy metals from water. The secret? No, it's not some high tech materials... It's the good ol' sea shell.

Kenya's water pollution rates and materials

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.

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