Beijia diatom pure is a pure natural mineral purification product. Its advantage is that its adsorption capacity is stronger than that of activated carbon, and it can automatically decompose harmful gases by adding decomposition components, thus avoiding adsorption saturation and secondary pollution, but its price may be relatively higher than the previous one. 1. Qinhuangdao Tianwei Jingye is an organization specializing in indoor decoration pollution detection and control, the only brand enterprise listed by CCTV, and the only enterprise that can effectively and thoroughly remove harmful gases such as formaldehyde, TVOC, etc. To control indoor pollution, we must choose a formal management organization. 2. Qinhuangdao Sentaimei Indoor Pollution Detection and Treatment Center may be your better choice. It can accurately detect formaldehyde and completely eliminate formaldehyde and other pollution. You can refer to both of them. Both of them are quite good, the prices are not expensive, and the testing is guaranteed.