25PK- 9.875″ x 2.5″ Coconut Shell CTO Carbon Block Water Filter for Whole House & RO. The specifications of the set are as follows. 25 of Block Activated Carbon filters Block Carbon Filters are similar in their performance to that of GAC filters, being made of fine coconut shell carbon they also do remove odors and tastes of many organic compounds, chlorine especially. Though, because this filters are made of a packed carbon (forming a cylinder block), they offer a much finer filtration of suspended particles and dirt. Dimensions: 9.875″ x 2.5″ Lifetime: Replace two or three times a year, depending on the water quality. This filter is wrapped and sealed and meets NSF Standards and Regulations. Filter will fit any Residential Reverse Osmosis Unit that features standard 10 filter housing. The item “25PK- 9.875 x 2.5 Coconut Shell Carbon Block Water Filter for Whole house & RO” is in sale since Friday, June 22, 2018. This item is in the category “Home & Garden\Home Improvement\Plumbing & Fixtures\Pumps & Water Filtration Systems\Water Filters & Filtration Parts”. The seller is “ezbuy_365″ and is located in Brooklyn, New York. This item can be shipped to United States.