Photocatalysis has some limitations on cleaning speed. In normal mode it is invisible but if the so-called volley release happens (for example, a bottle of nail polish remover is spilled), the photocatalyst alone will not cope. Therefore, photo purifiers are usually equipped with an additional standard adsorption filter. Most of these cleaners are also not designed for removing mechanical parts from the air. In general, an air purification system, set of filters, power should be calculated based on the type of premise and the level of its possible pollution.