Integral filter unit for rain water tank suitable for household use

摘要

Filter unit for rain water tanks is integrated in the cover of the tank and has a vortex fine filter and a filter column filled with limestone chips. The vortex fine filter has one outlet connected to the sewerage system and one connected to the filter column. The unit also has a flow moderator for water flowing from the filer column to the bottom of the tank. There may also be a mechanical switch for rejecting the first rain after prolonged dry periods, preferably between the vortex fine filter and filter column.