Water Filtration Systems
Water filtration systems are looked upon as the best way to take impurities out of water.
eColi can be filtered out of water provided the filter-screen is 2 microns.
That said, let's realize that 'dangerous-to-life' impurities frequently are microbial and are impervious to filters. Ultra-Violet (UV) radiation or chlorine can only deal effectively with bacteria.
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Water Purification Systems