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Water filters and purifiers?

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http://forum.allaboutcircuits.com – So my understandings of a water filter for humans is basically different then a water filter for fish operates. The human ones work on principles of gravity and filter meshes the heavy weight particles get stuck in the mesh or do to gravity set at the bottom of the filter. So I can see human filters preventing toxic/particles in the water that are heavier in weight then water but what about bacterial / viruses I would imagine these can get thru any water purifier unless there is some sanitation process of the water like distillation or other means... So correct me if I am wrong filters wil (Embedded)