There are two ways to recover air filters in air purification projects. One is the "dry method" commonly used, which is cleaned by air vibration method. The other is not commonly used, called "wet"". As the name implies, the wet method uses water to force the trapped particles away from the filter. The filter after wet cleaning needs drying before reuse.
Each method has its supporters. Proponents of dry methods focus on filtering efficiency. They believe that after the filter cake is formed on the filter medium, the air filter can reach their maximum efficiency. The dry process does not remove all the filter cakes, so the recovered filter has higher initial efficiency than the new filter. The dust deposited on the filter will filter the large holes in the filter and make the filtration efficiency higher.
The proponents of the wet process attach importance to the amount of dust and the efficiency of the design. A lot of dust will be removed during the wet washing process. The more dust is removed, the more dust will be captured by the recovered filter. Because the filter material has not changed, so the efficiency is the same as the factory setting. The more particles are removed, the more dust will be collected by the cleaning filter, so it will not need to be replaced frequently.
The two points of view have their merits. After using the air filter, the efficiency will be higher. When the filter particles capture particles, as more holes are partially packed, more smaller particles will be trapped. The purge air filter can not completely remove the particles packed in the filter, and some holes are partly blocked. When the filter is put into use again, the pores packed in these parts will prevent some smaller particles from passing through. On the other hand, the particles that stay on the filter are part of the total amount of dust. With the wet process, more dust can be removed, lighter than the dry cleaning filter, and has faster air flow.
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