Sanogene is a chloride dioxide liquid which has to be diluted with water to help battle hoof diseases like White Line Disease, Seedy Toe, thrush or to flush abcess holes.
Soaking a hoof is easiest in a bucket (if the horse can stand still in it). If not, then there are several soaking boots available online, like this one from Tubbease.
After opening Sanogene, it stays active for two weeks. Make sure you order enough if you need to treat the hoof more than two weeks!
English user manuel can be found here