This Re-mineralization filter contains a special carbon block that also adds calcium and magnesium back into your treated RO water, to balance the pH and improve the taste of your treated water, while also acting as a polishing filter. 

Compatible with any brand of RO!

Each filter has 3/8" push lock connections on both ends, so just cut the line running to your faucet and plug it in.  Recommend changing every 6 months.