Grout turning black after one use

  • Thread starter Billybuspass
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Billybuspass

Grout turning black after one use

Hi
I have just had my wet room tiled and after one use the cream coloured grout has gone black in random places grout compound has a mushy consistency when raked. Its in a few places. Anyone any ideas as to why its happened or a way to remedy it ?? Tiler said he doesn’t know why it’s happened but we need to find a solution to fix it. See below.

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