Filter Out Exposure to Harmful Impurities Filtering your tap water is not only a simple step toward a healthier lifestyle, it can actually decrease exposure to harmful impurities.3 Advanced reverse osmosis home water filtration systems ??? such as the Culligan Aqua-Cleer?? Drinking Water System ??? can reduce lead, radium, aesthetic chlorine, arsenic and other toxins, like hexavalent chromium.