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From LiveStrong.com:  Filtration alone will not remove all harmful bacteria. Carbon filters, for example, will remove organic compounds from your water, explains the Minnesota Department of Health. A reverse-osmosis system will further filter your water by passing the water through a semi-permeable membrane through the use of water pressure, according to Purification Engineering Corp. A submicron filtration system will remove microscopic-sized particles, reports Cyber Nook. However, to effectively get rid of disease-causing bacteria, you will need to use a disinfection system in combination with your filtration system such as a distillation, chlorination or ozonation water treatment device.
Read more: http://www.livestrong.com/article/257693-water-filters-that-remove-total-coliform/#ixzz28X9yMf5T