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  • The tile looks like pretty common indian slate. The issue was probably a void underneath, not properly back buttered before laying. The stone always comes in different thicknesses etc, so it's important to have 100% coverage to stop that happening.
    Best option would be to grab a couple of spares from a tile shop and pop those in after a thorough clean/strip of the rest of the floor's residue and previous sealer.
    Failing that, clean the loose out and fill with flexible grout and tone down with a sealer before sealing the rest of the floor.....it's a compromise though.

  • Thanks that seems fairly comprehensive. Do you have a method for cleaning? It’s our utility room so washing machine and drier aside, we can be quite disruptive.

  • Pop in a proper tiling shop (not Homebase etc) and have a chat. There are loads of really good cleaning products, some more corrosive/aggressive than others. You want something that won't damage the stone, whilst lifting the greasy gunk and left over soap etc, that will have built up. Once it's clean (and I mean CLEAN!) I can recommend a product called 'antidrop', which depending on how you want it to look, can either be Matt, satin or gloss. I like satin finish on those...I've fitted hundreds of metres of natural stone, as most tilers steer clear of it, for the reasons you've discovered!
    I'm not having a pop at your cleanliness by the way, it's just that it needs to be very clean before sealing, as the finish is better!

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