I have been using Sand Clear for over 13 years where we live. I swear by it. Our vet highly recommended it since we have a sandy soil. I do have hay mangers, but horses are horses. Our one horse takes the hay out to graze on the ground. Even with hay nets or bags, horses nibble anything on the ground. We do have 2 rotating pastures. During winter I feed them 2 feedings in stalls to prevent hay waste. I uses Sand Clear monthly from April to Nov after soil softens.