We are having a pool installed with an 8x8 sundeck connecting to full 20' long concrete steps. When we added the sundeck we asked the pool salesman if there is a standard size. We were told there is no standard. We chose Merlin Island Onyx as our pool liner. In researching liner colors I came across some photos of pools done with unsightly liner seams in the middle of the sundeck. I asked our pool builder to please ensure we did not have any seams on our sundeck and was told that there will be a seam every 6 feet. Are there any pros who have dealt with this issue? Are we less likely to see the seam given our liner color choice? Should we have gone with a 8x6' sundeck instead? What is done in the industry to preserve the aesthetic of the pool?