01-23-2008, 01:18 PM
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I've got a 50 Gal trough and use a swimming-pool skimmer to keep the hay, leaves and pine needles out.
I drain and wash it every 3 days. In hot, sunny weather, I have to do it almost daily in order to keep algee from growing.
Bleach, iodine, or anything else that will kill algee, will also kill-off the "good" bacteria in your horse's guts..... NOT a good idea.
There is no substitute for cleanliness.