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@CYOA
Efflorescence on an interior wall above a tap. There's no obvious damage on the outside. It's a thin pane of wall between two windows and it's about half way up with nothing obvious above or below either. I've brushed it off over the course of a week or so and it's still appearing. I'm about to paint and tile that wall so want to sort before I do so but am lost as to what the issue could be. Something inside the wall in terms of pipework? But the patch seems very high compared to where any pipes would be? A few coats of PVA and forget about it?