We have recently renovated our bathroom and a friend laid our tiles and grouted them.
Some of the grout is now breaking and having holes appear.I have used a grout removal tool to remove some of the grout and have found after scratching the surface the grout is damp deeper down. I think i will need to remove all grout and redo, but would like ton know why this has happened so this incident isn't repeated. Please help.:(


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