Slow sand filters
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United States of America Patent
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Mar 27, 1990
Grant Date -
N/A
app pub date -
Sep 28, 1988
filing date -
Oct 2, 1987
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The invention relates to an apparatus for cleaning a slow sand filter for a body of liquid while the liquid is in situ, in which there is a carrier adapted to traverse the body of liquid, and a device carried by the carrier and adapted to skim successive layers of sand from the filter. The carrier is a floatable vessel and the skimmer device is an auger. The skimmer device is controlled by depth control means which are automatically adjusted in response to the contour of the filter.
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