Which material should be used at the bottom of the pit to protect the liner?

Using a non-woven geotextile fabric at the bottom of the pit is a sound choice for protecting the liner. This type of fabric serves multiple important functions in septic system installations. Firstly, it acts as a barrier that prevents soil particles from migrating into the space beneath the liner, which can help to maintain the integrity of the system and prolong its lifespan. Additionally, the geotextile fabric allows for proper drainage while preventing clogging, ensuring that the liquid can flow freely without obstruction from fine soil particles. Moreover, it aids in minimizing the interaction between different soil layers, which can help prevent issues associated with settling or shifting that might compromise the liner.

While reinforced concrete may provide strength and durability, it does not offer the necessary filtration and drainage properties that geotextile fabric does. Plastic sheeting, on the other hand, may not allow for adequate drainage, potentially leading to water accumulation that could harm the liner over time. Natural clay, while it has some impermeable qualities, does not have the same protective benefits against soil particle intrusion and can also retain water, which is not ideal for a septic system environment.

Thus, using non-woven geotextile fabric is the optimum choice for protecting the liner and ensuring that the