Pre-filter – 200 and 500 L

The pre filter is useful after being filled with pozzolana and other filter materials. It has a « fuse » role in case of malfunction or in case of a lack of maintenance of the all-water tank or the decanter digester. In this case, matters in suspension go out of the tank or the decanter and these matters are trapped by the filter materials located in the pre filter. The role of the pre filter is very important, it prevents from the clogging of the spreading installations, the drained filter beds or infiltration wells.