Mmmmmm.......Cool, clean, water. How do you manage your horses' water? I personally don't have an automatic waterer. As much as I would love one, I just haven't manged to install one, so instead this is what I do. I clean my troughs at least once a week, and when I do that I use bleach. I scrub with a stiff scrub brush and a few cups of bleach mixed with some water and rinse well. Once I've done that and rinsed, as I refill the trough, I add about 3/4 cup bleach to 100 gallons of water. It really makes it no different than chlorinated city water. 1/2 cup bleach to my 75 gallon trough. I do this because I have well water and this helps to retard the growth of algae which is not good for your horses. Now, I've never had a horse refuse the water and it seems to help allot. Now another thing that I've noticed in doing this, is that when I do have a muddy area in the paddock where in the spring and fall the horses are more often, I've not had hoof thrush. I think that's because this where I clean the troughs and the bleach run off there just might be enough to help with that. No proof of that, though, just my own belief. This process works well for me and the horses here have fresh water in which they'll drink. I also keep my troughs up on cement blocks and this is because Misty has the tendency to climb in and splash. I keep a 35 gallon small rubber trough on the ground for her "puddling pool". So let me know what you do and if there's anything that you've found works well for you.