Acid-washed activated carbon is made of selected anthracite or coconut shell raw materials, and is refined through more than ten processes including activation, crushing and screening, fine washing and dust removal, and acid washing. The acid washed activated carbon granular has very little floating powder, greatly reduces the turbidity of the outlet water, and multiple rinses to ensure the product is pure, safe and reliable, and is cleaner and lower in ash than the activated carbon on the market.