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...and ''Giardia lamblia,'' but not viruses, so disinfection by chemicals or ultraviolet light is required after filtration. Effective chemical additives include ch == Ultraviolet purification ==

...stretching well in all directions and is waterproof. When treated against ultraviolet light, these tarps can last for years exposed to the elements, but non [[UV

...nd can cause injury for example if flicked in the face. With age, use and ultraviolet damage, the hard end will crack and the sharp edges so produced can cut the

...y or other [[topical]] product that helps protect the skin from the sun's ultraviolet (UV) radiation, and which reduces [[sunburn]] and other [[skin]] damage, ul ...ing either an [[organic chemistry|organic chemical]] compound that absorbs ultraviolet light (such as [[oxybenzone]]) or an opaque material that reflects light (s

...to wear these kind of glasses whenever outside to protect the eyes from [[ultraviolet radiation]], which can lead to the development of a [[cataract]]. Sunglass Excessive exposure to [[ultraviolet radiation]] (UV) can cause short-term and long-term ocular problems such as

...Nylon is chosen for its elastic stretch properties and good resistance to ultraviolet light. Polyester is about 90% as strong as nylon but stretches less under l