Take a look at the picture below. We have one of those cool 110 gallon Rubbermaid water buckets and ours has an automatic filler with a float valve (like a toilet). The hose we’re using to keep this bucket full is looking compromised so I haven’t been leaving the water on all day in the heat. The picture below was taken after a hot day with the waterer turned off. You can see the water line near the top of the bucket. Those two horses of ours sure drink a lot of water! Just a reminder to make sure those buckets are full each day.
BTW, we love this bucket and the waterer. I’ll write about it someday and include some other pictures and tips on how to keep the water clean.