© IoTank 2019

How does your septic system work?

When you need maintenance

Septic Layout.jpg
Septic tank layout
The diagram shows the standard input and output baffle lengths for a Septic tank.  The purpose of this layout is to prevent solids from leaving the tank, prevent scum from blocking the baffles and to enable settling of solids
Sludge Service_2.jpg
Scum Service_2.jpg
Sludge level high
Scum level high
Tank needs to be pumped when sludge levels are within 12 inches of the bottom of the output baffle
Tank needs to be pumped when scum levels are within 3 inches of the bottom of the output baffle
Scum_Sludge_Service.jpg
Sludge and Scum depth high
Tank needs to be pumped when scum depth and sludge depth together equal 1/3 the tank water depth.  
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Hydraulic retention / overload
The total quantity of effluent in the tank divided by the amount of wastewater entering the tank over 24 hours.  Acceptable hydraulic retention is 2-3 days.  Any retention time period under 1 day is considered hydraulic overload