Grouting the tiles around the outdoor fish tank

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Started early today nice and cool but true to form just as I finished it started raining.
So i think I’ll wait it out at the local coffee shop, I do hope when I get back it’s not all washed out.
It’s stopped raining now I’ll go back and check the damage.
I think i got away with it I”ll wait, let everything dry off a bit and then give a good clean it should be ok.