The Alkaline filter increases the pH of the reverse osmosis product water by adding minerals back in to the processed water.
In other words… Reverse osmosis water has been called “dead water”. This term comes from the lack of essential minerals found in the product water. An alkaline replacement filter adds the essential mineral back to the product water to provide faster hydration and to increase the overall alkalinity to 8.5-9 on the pH scale.
Drinking alkaline water is a better experience than drinking reverse osmosis all by itself. The minute amount of minerals added back deliver a satisfying flavor and leaves no after taste in you mouth.