These box style main drains are huge, and plumbed in a way so the entire pool can be gravity drained!
We don't normally have this much plumbing under the pool. But, because the desiged called for everything to tie into the main drains we plumbed extra lines from the skimmers and the trench drain to the main drains.
This is the equalizer line from the trench drain to the main drains.
Each of the three skimmers also had equalizer lines.
Once outside the pool, all the lines slope down into a man hole in the equipment shed.
Here is another look at how curved each of the side walls of the pool are.
