One disadvantage of having a septic system with a soil absorption pit is that, if solid material overflows from the tank into the absorption area, the area clogs and causes the system to fail.
Be careful what you plant near your septic tank and drainfield. Trees and shrubs have extensive root systems that seek out moisture and nutrients in the drainage pipes, and these roots can cause blockages. Opt for grasses and other plants with shallow root systems instead.
There's a reason why additives don't work to completely eliminate the need to pump a septic tank. Some of the solids in the tank are sand, grit, bits of plastic, and similar materials. No enzyme or bacteria can digest these.
When you are building where there is no sewer, among the first things you want to consider is where you might place a septic system. Siting is essential, because the system works well only when the situation is within certain parameters, so the decision is definitely a job for the experts.
