Filtering mounting unit, Pur's most advanced filter, provides clean, healthy-tasting water right from your tap at a fraction of the cost of bottled water. Reduces heavy metals (lead, mercury), chlorination by-products (TTHMs), agricultural pollutants (pesticides, herbicides), industrial pollutants (gasoline, additives), and 99.99 percent of microbial cysts, while retaining the beneficial fluoride in the water. Installs easily in minutes on all standard faucets without tools. Offers a bypass feature that easily switches to unfiltered water for washing dishes. Conveniently provides up to 100 gallons (two to three months) of quality water, right from your tap, with easy-to-change replacement filters. Built-in Automatic Safety Monitor gauge shows how much filter life is left and automatically shows you when to replace it. Rf-3050 Replacement Filter