The automatic Sand Filter multilayer sand filters consist of various filtration materials and substrates of different granulometry, such as silicate sand, anthracite, silica gravel, etc. They are placed in the vessels so that the material with the smallest grain size is at the top of the filter. The unfiltered water passes through the filtration beds with flow from top to bottom and gradually leaves its turbidity in the mass of filtration materials. The automatic valve is the Pentair 263 / 740F. The multilayer filter achieves excellent quality filtered water that meets your requirements by removing water turbidity, sediments and microparticles. The particle filtration capacity is better than 10 microns.