The Mondeis can also be used for agriculture, which requires a lot of water. Once you have established a closed-loop life support system, all the water that flows through the plants and the people who eat the plants are recycled, so there is no need to continue to add much water to the system. The large amounts are needed only for the initial setup, or to increase the number of people on the moon when more agriculture is needed. However, a major problem of lunar agriculture is the long moon nights. The plants are not adapted to it, so that artificial lighting is required, which requires very large energy systems.