1. Long-term return: Long-term operation and maintenance of water source replacement PPP project requires long-term financial support. As a long-term investment tool, the fund can provide a stable and sustainable source of funds to pay the operating expenses of the project.

2. Multi-party investment: PPP projects of water source replacement often attract the participation of many investors, including financial institutions and funds. With the capital investment, they can bear the operating expenses of the project and share the risks.