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Veni, vedi, fish velocipede
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A thin mesh net catches the dirt. but it is immediately sent
back into the nearby incoming water stream by a thin
Once the main liquid stream is finished, or periodically for
continuous stream, the highly concentrated dirty liquid
is just ahead of the net can
be directed or rinsed out to
storage or to removal pipes.
Sand filter backwash cleaning
[mouseposture, Jul 24 2011]
or Google 'autostrainer principles' [Ling, Jul 27 2011]
||This is so close to a candle type auto-strainer, that it would probably be best for you to check one out and see if it matches your idea.
||but mine is not once in while backwash, but rather
continued backwash, where the dirt almost never
reaches the net (or sand) in the first place.
||ling could you give a link?
||How can the dirt never reach the filter ?