Wastewater land treatment systems are promising for cleaning up water due to their simplicity, cost-effectiveness, and efficiency. Research has shown that using techniques like sand filters and wetlands can help renovate city wastewater, but they may have limitations in handling high volumes. Adjusting methods based on local conditions can help address this issue. Additionally, using land treatment techniques for pretreating lightly polluted water before drinking can be a cost-effective and efficient solution for removing harmful substances.