I use an empty supplement tub full of water to keep his smaller amount of 'daytime' hay submerged for the required 12 hoursso that I don't have to fill the bucket right to the top.
I understood that you should only soak hay for a maximum of 20mins otherwise it is the equivalent of feeding raw sewage!!![]()
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The hay starts to ferment or something horrid and all nutrients leach out. It only needs to be soaked for 20mins to allow the spores and dust to swell so that they are ingested rather than inhaled!![]()