lcavada

I have a 12,000 gallon pool with a separate (but attached) spa. the pool has a skimmer and a vacuum outlet. Several returns through the pool and 1 return in the spa. Into the pump i have 3 large pipes. They were originally labeled when the pool was made. 1. Skimmer 2. Vacuum 3. Drain Is it safe to assume that the main drain in the spa is connected to the main drain of the pool and they are combined to be one line coming into the pump? thanks