Which of the following substances should not be placed in septic tanks?

Septic tanks are designed to treat wastewater through natural processes involving bacteria that help break down solid waste. When considering what substances can or cannot be placed in septic tanks, it is important to avoid anything that can disrupt the natural balance of bacteria or the overall function of the septic system.

Bleach is a strong chemical that has disinfectant properties and can kill harmful bacteria, but it is also detrimental to the beneficial bacteria in a septic tank. These beneficial bacteria are essential for the breakdown of solids and the proper functioning of the septic system. Introducing bleach can severely inhibit the bacteria’s ability to function, leading to a buildup of waste and potential system failure.

In contrast, kitchen waste, when properly managed, can be broken down by bacteria in a septic tank, though it’s important to avoid putting in large amounts of grease or fibrous materials. Compost, when used appropriately, can contribute organic material to the bacteria. Water is also essential to maintain the right level of moisture for proper biological activity in the septic tank.