Watts Premier 560059 PH Balancing Ceramic 9-Inch Filter with 1/4 Inch QC Fitting The six layers include a sediment filter, mineral filter, pH balancing alkalization through ceramic media, ceramic phase for ray release and activation of water, coral media for proper pH balancing and a final sediment filter Filter re-mineralizes, pH balance, proper alkalization, far-infrared activation and balanced mineral elution of RO water Intended for use as a re-mineralization post filter for all reverse osmosis systems on the market Kit Contains one 9-Inch pH balancing ceramic filter and Two 1/4-Inch easy to install quick connect fittings Six month filter