There are many ways plumbing can be done. We don’t know what is in his mind. Ask him to draw a plumbing diagram for what he plans to do so you understand it.We picked the plumber and we were just having a conversation about it. He was going to leave it in just in case but asked what we wanted. I wanted opinions here first. I did ask him about the channel drain and I didn’t understand his reply. This was before figuring out he was still planning on the vacuum. He said, “honestly you are doing a vacuum so it doesnt realy make sense. thre drain is tied with the skimmer so it doesnt pull suction unless you put a diverter in the skimmer”. What does this mean?
I would have specified that all skimmers and vacuum lines are home run to the equipment pad. And ai don’t know where the channel drains fit into your design.