<human>: Can I make a septic tank out of concrete?
<bot>: Yes, you can. Concrete is one of the most common materials used to build septic tanks. However, it is important to ensure that the concrete meets the requirements for use in a septic tank. For example, the concrete should be thick enough and have adequate strength to support the weight of the tank. Additionally, the concrete must also be impermeable so that no wastewater seeps through the walls of the tank.