I purchased a home with pool and spa last August. The owners did not leave any information about the schematics on valve operation or anything related to the pool. I do know the pumps are hayward and it has a sand filter by hayward and a natural gas heater. In normal operation the spa overflows into the pool, however, after we had a guy close our pool, when we opened it and turned the pumps on, the water drains out of the spa and now the water level in the pool is above the skimmer box. I attached some pictures of the system, so if there are any suggestions, please help me!