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There are so many choices available;
it can be really confusing to choose any one brand out of the dozens. Lets see how we can make this choice simple. The question you need to be asking here is what all should the best whole house water filter be able to do?
Heres the answer Remove all impurities from the water This really is a no-brainer. The essential test of a water filter is to be able to remove all kinds of contaminants from the water supply without this ability, a water filter is absolutely no good at all! The surprising part is, many popular filters are not really able to do so. They will remove one kind of impurity, but will leave other contaminants untouched.
For example, Reverse Osmosis purifiers are can only remove big impurities like dirt, bacteria and heavy metals;
but they are not able to remove chemicals like pesticide and fertilizer traces from the water. The molecules of these chemicals are so small, they can easily pass through the membrane these purifiers use for filtering the water. Preserve waters natural mineral content This is an important point.
Nowhere in the world will you find water in its natural state devoid of minerals. In fact, the human body has evolved over the centuries to expect minerals like Calcium and Magnesium in the water we drink. Many purifiers, like RO for instance, remove these minerals during their purification process. Drinking this de-mineralized water can cause their deficiency in your body and pave the way for many health problems later.
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Source: (best whole house water filter) http://whole-house-water-filters-reviews.com/best-whole-house-water-filter/