Flocculation allows to obtain a crystalline water. There are two kind of flocculation: inside the filter and in the pool. With the first one we increase the fineness of filtration in order to eliminate smaller particles. For this process we introduce flocculants cartridges (incompatible with cartridge filters) in the skimmer basket. The second one helps us to group all the impurities that are the beginning of brown water thanks to liquid flocculant.