The researchers studied waste stabilisation ponds treating household wastewater. They checked different pond units to see how well they worked. The ponds had too much sludge. The incoming water was very dirty with lots of contaminants. After treatment, the water still had high pollution levels, breaking environmental rules. The dirty water could harm rivers and land. The ponds didn't clean the water enough. More work is needed to fix the problem and avoid polluting the environment. The study shows the ponds need help to work effectively and not harm nature.