The ALONDES air purifier was originally designed with a second-generation HEPA filter that blocks airborne dust, animal debris, and some coarse ions. However, this filter has poor permeability and low utilization. In response to this situation, Eurolands continued to improve the technology and developed a new technology in 1975 through repeated experiments. This new technology can filter out all harmful gases and achieve clean air. Now, ALONDES air purifier combines vacuum fiber activated carbon filter technology, nano HEPA high-efficiency technology and photocatalytic purification technology, and the unit volume of filtration is upgraded to 0.3 nanometers. It is known as the formaldehyde net technology and has created many miracles in the industry.