An installer asked: Do you know of any studies comparing use of straw/hay, building paper and geotextile fabrics in terms of their ability to prevent fine solid migration into a sewage treatment trench? At the date of this writing, we have not found a reference that provides any direct comparison of these common materials when doing the final cover over sewage treatment trenches or beds. Perhaps one of our readers can point us to such a study done locally through a university, government or private entity.Even though we have been somewhat stumped, we thought it would be a good idea to write
