: I have to install a mound spetic system. I would like to do it my self. Do i need to use special sand? what do i need to get started. Is there any information on cost?
Go to your local health department and ask for literature they have available to the public. The mound is created because your soil does not have adequate percolation rate to dispose of the sewage contaminates before they reach the water table. The contaminants are consumed by microbes and both aerobic and anaerobic bacteria that live in the mound and thrive on the heat and moisture. Sand won't provide a stable enough environment for the microbial action since it doesn't have the nutrient value of diatomateous earth. Clay soil retains water and swells up, which won't let enough water percolate away, and causes an overburden of anerobic bacteria. When the mound is constructed too shallow,and only of sand, it freezes the bacteria in cold weather, killing off the anerobic bacteria.