Using regular cement based grouts made for flooring tiles will not last very long, there are special grouts made to withstand the discoloring effects caused by chemicals used in pool maintenance. Also swimming pool tile grout is made to have a waterproof matrix in the cement that minimizes the staining. There are a few companies who specialize in just cement based products made for Swimming Pools. Also if you are going to make a repair I would suggest one of the pool tile repair kits because they come with a bonding agent to help the grout last longer as well.
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Yes, you can use ordinary ceramic wall tiles (CWT) for swimming pool but it wont be as durable as the vitrified tiles (VFT). CWT were not as hard as the VFT and only inteded for residential or wall uses. The thin glazing will easily chip specially on edges and will cause injury to the users.
My opinion, if your on a budget, use the vitrified floor tiles, if you want durability, use the porcelain or homogenius tiles.