| http://www.w3.org/ns/prov#value | - How it works: A semi-permeable membrane separates impurities from water. (Note: This filtration technique wastes a substantial amount of water during the treatment process.) Ultraviolet Disinfection Gets rid of: Bacteria and parasites; class A systems protect against harmful bacteria and viruses, including Cryptosporidium and Giardia, while class B systems are designed to make non-disease-causing
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