③Frizzlife Alkaline Remineralization Water Filter TD-9 introduces new-tech blending multiple kinds of 100% natural particulate materials and coconut shell activated carbon filter simultaneously in one block filter, which effectively alters the pure water after reverse osmosis filtration into a better drinking standard. 1)Restore Minerals: The RO systems removes not only harmful contaminants but also removes helpful minerals. The filter restores minerals back into the RO water, ensuring your daily mineral intake. 2)Adjust pH+ Level to slightly alkaline: The pure water treated after Reverse Osmosis membrane is slightly acidic. The TD-9 increases the pH+ value to over 7.5 to better fit human body. 3)Further polish the water taste and remove anything else harmful: High-grade Acid Washed Coconut Carbon Block helps to further remove contaminants and improve taste of the RO water.