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Eig. 31. Illustration of the reverse-ow system which is used in some sub—gravel
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large area of the hood prevents graVel from being suckedïup.*In£this »
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atrànge1üeñt, äll_ debris is trapped under;the
filter plate.,(After Vortex) _“
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B‘Oth mechanical and biologiŒl—;lteps cari, of
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awater pump
and this will enable larger flow -rateS to be used if”
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peeded. 'The‘ptimp is usually situated below the leVel of
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theaquaü°€nVlf0nmenthaVebeendlscussedels€Whefe(P15)Thls:
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