Answer:
Because the raw material and food waste can become contaminated with microorganisms. In addition, the effectiveness of the disinfectant decreases over time.
Step-by-step explanation:
Organic matter and food scraps are great culture media for the proliferation of unwanted microorganisms. These microorganisms cause the decay of organic matter and food waste, which reduces hygiene in their environment and can cause disease and attract unwanted animals. For this reason, it is very important that you change disinfectant water when it becomes dirty or contains organic matter such as food scraps. In addition, the disinfectant has its potential reduced over time, so you need to change it.