GrowMax Water Reverse Osmosis Systems are the best available for the growing and gardening industry today. These units include features like pressure gauges, flow restrictors and automatic shut-off valves to ensure your system will maintain optimum performance and reliable service for many years. It removes up to 100% of all salts, heavy metals, chlorine, herbicides and pesticides, volatile organic contaminants, nitrates/nitrites. Advantages - Eliminates up to 95% of all salts and heavy metals. Helps to stabilize the pH. - Protects beneficial micro-organisms in your soil. - Get 100% effectiveness from your nutrients and fertilizers - Great for organic growers