Which of the following should not be flushed into a septic system?

Flushing diapers and chemicals into a septic system can cause significant issues. Diapers do not decompose well in the septic tank and can lead to clogs in the pipes and the tank. The materials used in diapers are not biodegradable in the context of a septic system and can contribute to system failure. Similarly, harsh chemicals can disrupt the natural bacterial balance essential for breaking down waste in the septic tank. These chemicals can kill the beneficial bacteria that help treat wastewater, leading to system malfunction and costly repairs. Therefore, proper waste management practices, such as disposing of diapers and chemicals through regular trash disposal, are crucial for maintaining the functionality and longevity of a septic system.