LiquaGen DUAL IN-LINE POST CARBON (GAC) & ALKALINE WATER FILTER CARTRIDGE for any RO System Receive the benefits of GAC Carbon & Alkaline in one water filter at a fraction of the cost! Benefits of Alkaline: Improves metabolic functions, significantly helps the body absorb minerals because of its high oxygen content, pH Alkaline Filter has the ability to raise the pH of the filtered water up to 10.5, Benefits of GAC Carbon: Removes chlorine, bad taste, odor, THMS, turbidity, dirt, and sediment. One pound of carbon contains a surface area of roughly 125 acres and can absorb literally thousands of different chemicals. The Membrane in the RO SYSTEM depletes the pH level. This filter will not only help restore the pH level but increase it ! The filter needs to be replaced every 2 years or 1,500 gallons-which ever comes first. 100% handcrafted in the USA | Super easy & convenient installation | No Hassle Return Policy |Satisfaction Guaranteed. This supreme handcrafted 2" x 10" filter is an excellent add on for Reverse Osmosis Systems, refrigerators, and ANY other type of drinking water systems. With this filter you wont need a post inline carbon filter-this would the final stage therefore being extremely COST EFFECTIVE.