I was wondering if I should be concerned about my mare getting sand colic and if is should add some Sand Clear to her feed. She eats out of a hanging bucket, but drops some stuff and eats that up off of the sand. It's not very loose sand, rather hard packed because of the clay mixed in.
I never really thought about it until a few days ago, now I can't stop wondering if I should be worried about it.
What you can do is take a few poop balls from a pile and put them in a bucket of water. Let disintegrate in it and then slowly spill the water out. If your horse is ingesting sand then you'll see some at the bottom of the bucket. I feed one of mine sandclear monthly. I do the 7 day purge and it seems to work for him.