Solids are intended to fall to the bottom of the first chamber and accumulate as a layer of sludge. Sedimentation is the term for this action. Organic material that hasn’t entirely broken down, such food scraps and paper goods, makes up the sludge layer.
The sludge layer normally sinks to the bottom of the septic tank because it is denser and heavier than the water and other components of the tank.
Grease and oils are intended to ascend to the top of the second chamber and form a scum layer there. It is known as flotation to do this. Lighter substances like grease and oils that float to the top of the tank make up the scum layer.
If present, the third chamber acts as a partition between the first two chambers. It makes it possible to treat wastewater more effectively by preventing the mixing of the scum and sludge layers.
Once more, the best kind of septic tank for a certain site relies on a number of variables, so it’s crucial to speak with an expert to find the best option.