Interesting product. I often wondered if there was a supplement or anything similar out there that could help deer. This is a little different than that idea, it is meant to treat the water and muck around your known watering holes. Time will tell if this product is worthy of it's name or if it is just a gimmick. Guess you'd have to have an EHD outbreak to prove it wrong.
ehd-fense.com

EHD-fense™ Water Treatment Kit for Deer | No Dead Water. No Dead Deer.
EHD-fense is a three-part, all-natural water treatment kit developed to help prevent Epizootic Hemorrhagic Disease (EHD) in deer. By improving water quality and reducing muck, EHD-fense creates healthier aquatic ecosystems that midges cannot thrive in. No dead water. No dead deer.
