Anyone use Purina W/S Well-Gel?

I bought a horse that had black diarrhea when I bought him… After 5 years and four different Vets trying to help him and nothing helped… my Vet wanted me to try a trial period of W/S Well-Gel. The Vet stated that we may have to adjust the dose over a period of time. I bought it through my Vet and it was much less expensive than any where on the internet. The first container we started him on one level scoop twice a day… The first container helped him get better but not completely… The second container I filled each scoop (1scoop 2xday) as full as I could get them…very heaping… By the time I finished the second container, his diarrhea was completely gone. I went to the vet to get more and they had to order it… It was back ordered and after a month…of not taking it, he still had normal poop… So I did not need to get any more. I was so pleased that he no longer had his problem.