The DWSB Series Reverse Osmosis Drinking Water System reduces harmful contaminants and turns common tap water into the fresh, quality water that nature intended us to drink. A 5-stage system filters water at the molecular level. Drawn water passes through a final carbon filter to remove any unwanted tastes or odors. The result is simply healthier, better tasting water. Features Include: 1. Environmentally sound water treatment. 2. Cost effective: the daily cost of bottled water will no longer be a concern. 3. Convenient: fresh, clean water ready at your tap – no more handling of jugs. 4. Easy to maintain: uses standard 10″ cartridge filters. R.O. System Pre-Requirements 1. Less than 7 GPG Hardness 2. Less than 0.1 PPM Iron 3. Less than 0.05 PPM Manganese 4. No Hydrogen Sulfide 5. Use only on microbiologically safe water