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Grout is a fine compound, either ready-mixed or sold as a powder, and is used to fill the gaps between tiles.
If the gap between the tiles is equal to or less than 4mm (1/8in) then you should use non-sanded grout. If the gap between the tiles is larger than 4mm (1/8in) then you should use sanded grout. If you use non-sanded grout on larger gaps, the grout can shrink and crack when it cures.
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