We are in the second week of our pool being filled and brushing every day. I noticed that the top half of our pool is a much darker shade of blue than the bottom. I thought this was a shadow at first, but I got in the pool and looked and it’s definitely a color change. It seems to go all around the pool at the same height. While filling the pool, the water was not stopped at any point. Is this normal? Should I bring this up to the builder? Picture for reference. Look at the darker shade near the top of the surface and notice the lighter shade at the bottom. There’s a distinct line where it changes

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