These may require the removal and adjustment of individual pebbles so that the sheets interlock to avoid visible grout lines. They can also suffer from iron mineral (red or brown or pink) staining. If this occurs remove the affected pebble from the sheet and replace it with one of a similar size from a spare sheet Again, this is completely normal for naturally occurring minerals and does not
mean it is defective.
For further information please follow this link for the full fixing guide:
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