spotty_pony
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I posted a few days ago about the white bits I found in the bottom of one of the horse's water buckets at the yard where I work at. I decided to see whether they were coming from the bucket or the horse so I swapped the water bucket with another horse. When I mucked them out today, the bucket which previously contained the white bits is now fine and the bucket I gave to that horse once again had white bits in it - so it is definitely coming from the horse, not the bucket.
How no idea as to what they could be though!