Description Matrikx CTO  Carbon Block Fits all MERO reactors and all standard 10 inch canisters (2 3/4 x 9 3/4 inch) – 5  micron filtration. –  Chlorine and Odor reduction – Excellent Contaminant reduction – High Dirt holding capacity – Exceptional low pressure drop – NSF and WQA certification for material safety – Manufactured from NSF standard 61 certified coconut shell carbon – Manufactured using FDA-compliant materials – Drop-in cartridge provides quick and easy filter change – Optimized to perform as both a sediment and activated carbon filter – Radial flow (outside-to-inside) filtration provides increased dirt-holding capacity – Made in the U.S.A.