Hi Mary - I agree with the ...

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Hi Mary - I agree with the reservations regarding sand filters expressed by others.  Perhaps a different approach would be better, such as the geotextile-based filtration system used to clean stormwater by Urban Stormwater Technologies' Catch Basin Inserts - please see: www.urbanstormwater.com.au

These systems may be easily adapted to suit a wastewater treatment application, and will not clog if they are properly maintained.