Oh man Sandie is shedding like CRAZY right now!! When I'm done grooming her it looks like it has snowed around her! Lol (and it's also all over my clothes!) The hair seems never ending too...I keep wondering when she's going to stop looking so wooly, since she's obviously shedding so much of her coat!
I can pull clumps out if I grab a little section at a time, but normally I just use a shedding blade and/or rubber curry comb and it comes out in clumps that way too. It's similar to a dog that sheds, except way more hair! If I run a gloved hand down her back, my hand will be absolutely covered with hair!!
This might make you feel better...a photo I found online of someone's feet after they groomed their horse in shedding season!! Sandie's not THIS bad, this must have been a pretty wooly horse, but still, horses can shed a little or they can shed a LOT. Is your horse's hair coming out from all over the body, or is it localized to just one spot?