Quantificaton of biofilm build-up in filters when intermittently loaded with low-strength synthetic wastewater

►This paper examines various media when loaded with low-strength wastewater. ►Biofilm formation in polishing filters occurs mainly in the uppermost filter layer. ►Volumetric water content can be used to determine biofilm build-up in filters. ►Volumetric water content eliminates the need for destructive sampling of filters.