4 Gallon Water Cooler Filter Purifier - Save $$$ - Place on Cooler - Transform Tap Water to Healthy Mineral Drinking Water For use on dispenser/water cooler. Transforms ordinary tap water into clean, healthy, mineralized alkaline drinking water - Save $$$ - 1 System; 5 Functions: Filters, Purifies, Mineralizes, Alkalinizes, Preserves Multi-stage filtration removes bacteria, harmful contaminants, chlorine, chemicals and other impurities Adds essential minerals and bio-energy properties to boost overall health and vitality BPA-Free. No electricity or plumbing required. Easy assembly. Convenient, versatile & affordable