Asia’s largest manufacturer of activated carbon block, Siam Cast Nylon Co. Ltd., of Bangsai, Thailand, presents its activated carbon block that has achieved the WQA Gold Seal. It’s a high performance product with 99 percent chlorine reduction. It’s made up of 100 percent coconut shell carbon. All materials are FDA and NSF approved. It carries the ISO 9001 manufacturing standard. Lastly, quality is assured.