Is the pH of a pool drops below 7.0 calcium deposits will buildup which may may scale of the plumbing the tiles and the pool finish?

Yes, when the pH of a pool drops below 7.0, it becomes more acidic, causing calcium carbonate to precipitate out of the water and form deposits on the pool surfaces. These deposits can lead to scaling on the Plumbing, tiles, and pool finish, which can be difficult to remove and may damage the pool over time. Regular monitoring and adjustment of the pool's pH levels is important to prevent this issue.