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As indicated by others, it is important to understand why you need a filter. If the source of water is a borehole, it will be important to protect the area around the top of the borehole to prevent contaminated material from the ground surface, including dirty water, from flowing down the hole and contaminating the water source. The groundwater itself, depending on the depth and rock type in which it occurs, may have concentrations of mineral material which are not healthy if consumed over the long term. Therefore, if there are no chemistry results from nearby boreholes in the same rock type, it is very important to first conduct such an analysis of water quality and then decide what kind of treatment options, if any, are most suited.