空气净化工程有两种回收空气过滤器的方法。一种是普遍采用的“干法”，采用空气振动法清洗。另一种不太常用，称为“湿法”。顾名思义，湿法要用水迫使捕获的微粒离开滤材。湿法清洗后的过滤器在重新使用前需要干燥。
　　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.
　　每种方法都有支持者。干法的支持者关注过滤效率。他们认为，滤饼在过滤介质上形成之后，空气过滤器才可以达到它们的效率。干法不会去除所有的滤饼，因此回收的过滤器比新过滤器的初始效率高。过滤器上沉积的灰尘会填塞滤材上的大孔，使过滤效率变高。
　　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.
　　湿法的拥护者重视的是容尘量和设计效率。大量的灰尘会在湿洗过程中去除。灰尘去除得越多，回收的过滤器捕集到的灰尘也就越多。由于滤材是没有改变的，因此效率与出厂设置还是一样的。去除的微粒越多，清洗后的过滤器捕集的灰尘也就越多，因此也就不需要经常更换了。
　　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.
　　两种观点都有其优点。使用后的空气过滤器效率的确会变高。当滤材捕集微粒时，随着较大的孔被部分填塞，更多更小的微粒会被截留。吹扫空气过滤器不能完全去除填塞在滤材中的微粒，有些孔还是部分阻塞的。当过滤器再次投入使用时，这些部分填塞的孔隙将阻止某些较小的微粒通过。而另一方面，停留在滤材上的微粒是过滤器总容尘数量的一部分。采用湿法工艺则可以去除更多的灰尘，比干洗的过滤器会更轻，具有较快的空气流速。
　　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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