Rapid filtration of water is used when the amount of water required is higher. Retention mechanisms in suspension within water filter layer, if this type of filter can be grouped in the following categories: retaining your grain filter material, filter layer retention in interspaces. Retaining the space filter granules is explained with the action of the subsequent factors: direct contact involving particles dispersed in water filter granules, inertia scrolling on the certain trajectory of spread particles, adsorption, electrostatic energies. Because retention of uncooked water suspension, the filtering is clogged gradually, ultimately causing increased pregnancy loss, practically reduced water flow in the filter. Date filter in the slow pumping at a normal cycle is 20-30 times. Life depends mainly to the wear, the way is maintained and looked after. Market demand for such devices is high. For efficient operation and excessive efficiency filter cleaning is actually recommended, which involves removing work surface impurities accumulated surgery that is done manually, with earthmoving tools after water filter has been removed, sent to the individual. My websites: Submersible Pump - water collection process at depth