... Used, such as air purifier, air-conditioning system,car filter , waste gas treatment....etc.2. Comprehensiveness: Photocatalyst can greatly decompose formaldehyde ... photocatalytic efficiency .6.Strong bactericidal, deodorization, air purification .....effect Test for Photocatalytic Filter Test ItemTest time Test StandardRemoval ratioFormaldehyde1hGB/T18204.26 ...