I am wondering if someone can tell me how to keep my water buckets from turning green? Right now I am emptying them every other day, and this is causing a huge mud puddle in my field,. Someone told me to put a little bleach in them about every 3-4 days, is this ok for horses and how much bleach? I don't want to make my guys sick, but the water buckets are becoming a real problem. I need advice and any secrets anyone may have.