38. Area of the sand-filter bed: The area of the sand-filter bed of an above-ground soil absorption system for an isolated dwelling must comply with the minimum standards in the following table, according to the origin of the effluent and the number of bedrooms:
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Number of bedrooms Minimum area of the sand-filter bed
(square metres)
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Effluent from a Effluent from a
primary treatment secondary treatment
system system
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1 18 12
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2 26 18
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3 39 26
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4 52 35
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5 65 44
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6 78 52
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The area of the sand-filter bed of an above-ground soil absorption system for another building must comply with the minimum standards in the following table, according to the origin of the effluent and the total daily flow:
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Total daily flow (litres) Minimum area of the sand-filter bed
(square metres)
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Effluent from a Effluent from a
primary treatment secondary treatment
system system
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0 to 540 18 12
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541 to 1080 26 18
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1081 to 1620 39 26
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1621 to 2160 52 35
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2161 to 2700 65 44
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2701 to 3240 78 52
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