Hi Mary I agree with some ...
Published by Seyed Mehdi Borghei, Chairman at GESCO Co.Ltd
Hi Mary
I agree with some of the comments. Grey water has enough BOD to enhance biological growth in sand filter and you will face clogging in no time. You must use a conventional biological system to reduce BOD to levels that will not cause clogging, ie less than 10 mg/L.
If not possible forget sand filter, it won't work.
Mehdi Borghei