Viscose based carbon felt Usage As for DZL high temperature activated carbon needled felt dosing through 700°C, it is made from carbonization treatment. It can absorb the poisonous and smelly dust in the water or air. Its filtration efficiency is 10-20 times than particle activated carbon. Application On the basis of effect for usual filter purification, it can clear the abnormal taste, SO2, ammonia and other pollutants efficiently in the air. The air supply quality of air conditioner system will be improved to meet the needs for civil use, electric and nuclear industry.