Advertised as the safest water filtration systems, the home reverse osmosis systems come with pluses and minuses just like all the other water filtration systems available on the market. The first question people ask is how safe and purified water is through a filtering system. Well studies show that home reverse osmosis system, which are usually more complex, can purify water up to 99.9% which means that one can actually improve or maintain his or her health through reverse osmosis systems.