You might think that a reverse osmosis water filter is a good choice to improve the quality and taste of your tap water, but unless you live in a rural area with a really questionable water supply, you would really be wasting your money. If you are like most of us, the water from your tap has already passed through a reverse osmosis filter. That doesn't mean that it's completely safe or that it tastes good. Most water treatment facilities use a reverse osmosis water filter during one step of their operation. Large particles are trapped by the membrane of the reverse osmosis filter . Small particles still pass through. You see, the reverse osmosis water filter was designed for large scale operations, industries that require de-mineralized water and for people traveling in outlying areas without public water. The reverse osmosis filter that companies are promoting for in home use is not what most of us need. They are expensive and inefficient. They waste more water t...