I found a porcelain mosaic tile that I like for my spa and spillway but could not find a 6x6 waterline tile in stock. Could I use the mosaic for my waterline? Any cons to using a mosaic vs a 6x6 tile?
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Biggest down side is lots of grout lines. Grout will tend to wick water up if not properly sealed and maintained, etc. That will cause scale to form from your hard water and evaporation.
I suggest you read ABC's of Pool Water Chemistry.
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