Hi Mary - I agree with the ...
Published by Robert Humphries, Dr.
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.