The WF1010 Reverse Osmosis In-line Alkaline Filter by Tier1 is a high quality Alkaline water producing replacement filter for your Reverse Osmosis system. Reverse Osmosis filtration while excellent at filtering contaminants also filters out many healthy minerals from the water and makes the water slightly acidic. This alkaline filter will not only neutralize acidity but raise the pH of water above 7 by adding back in the natural alkaline minerals of calcium and magnesium. The 1/4” quick-connect fittings mean that this filter can be connected to any RO system with 1/4” water line for the faucet to provide healthy clean alkaline water for you and your family!