Should the first compartment of a septic tank be smaller than the second compartment?

The design of a septic tank typically consists of two compartments, and the first compartment is generally larger than the second compartment. The primary function of the first compartment is to allow for the initial separation of solids from liquids, promoting anaerobic digestion and settling. This compartment needs to have adequate space to accommodate the incoming wastewater and to facilitate the settling of solids effectively.

A larger first compartment is crucial because it provides the necessary volume for sedimentation and allows for the retention time needed for proper treatment. The second compartment, while still important, serves mainly to further treat the effluent and separate remaining solids and scum. Hence, the first compartment's size is designed to handle the bulk of solids and encourage microbial activity, making it essential for it to be larger than the second compartment.

In summary, the first compartment of a septic tank should not be smaller than the second compartment because it serves a key role in the initial treatment process by allowing for adequate solids separation, which is vital for the overall efficiency and effectiveness of the septic system.