Concrete, fibreglass, or plastic are frequently used in the construction of septic tanks. Here is a summary of the septic tank construction process for each type:

Cement septic tanks

Concrete and reinforcing elements are mixed to form the tank during the casting process to create concrete septic tanks. Once mixed, the concrete is poured into a mould and left to harden until it can be removed from the mould.

Composite septic tanks

The construction of fibreglass septic tanks involves layering fibreglass matting and resin in a mould to get the desired shape and size. The tank is then let to cure for however long it takes for the resin to properly harden and become robust enough to be removed from the mould.

PVC septic tanks

Injection moulding and rotational moulding technologies are used to create plastic septic tanks. Injection moulding involves melting plastic, injecting it into a mould, and then letting it cool and harden.

In rotational moulding, a plastic powder is poured into a mould, which is then rotated to spread the powder evenly. The plastic powder is then heated to melt it and make the desired shape of the tank.

Generally speaking, depending on the particular type of tank, septic tanks are built utilising a number of materials and techniques.

A mould is used to stack layers of fibreglass matting and resin to create fibreglass septic tanks, layers of resin are used to create plastic septic tanks, and injection moulding or rotational moulding procedures are used to create concrete septic tanks.