My system failed! Should I put in an aerobic treatment unit? This is another homeowner question that usually follows or precedes a question about how and when oxygen is important in a system. In a previous column we discussed formation of the biomat and the relationship between the organic loading through measures of BOD and FOG, and development of a more resistant and thicker biomat.Adding more pretreatment components – along with altering household practices – is a way to address the organic loading issue and keep biomat development at levels where the soil is able to hydraulically accept the water
