How it works: The fleece filter rolls are inserted into the filter devices. The water is fed from the filter pan into the interior of the filter housing by means of a pump. When leaving the filter housing, the water passes the fleece filter where the suspended matter is mechanically captured. The filter paper loses its effect as soon as the paper is clogged - the water level rises as a result in the filter chamber. The used paper is rolled up using a roller system and fresh filter paper is drawn in.
While manual filter devices are designed for purely manual operation, with technically mature fleece filter systems such as those from Deltec or Theilling, the rising water level in the filter chamber is registered via an integrated float switch and the filter fleece/paper is transported onwards via a gear motor. Manual filter devices can, for example, be retrofitted to an autonomous system using an upgrade kit.
The properties and differences of the various filter systems result from manual or automatic operation, the amount of water throughput (L/h) and information on the appropriate water level in the filter pan.