I'm having a problem with this. The first time I made it, I researched it on line as to how to make it and followed the directions. THAT site said to keep the feed in a one gallon glass jar with a one inch of water to cover. And let it set four days in a COOL dark place.. I used Flock Raiser for my fermented feed that time, and it came out fine, the chickens liked it. I kept it in our cool dark basement. The next time, I tried corn. This did not work well. Both times I tried it, the corn got moldy. I was using just water, and the corn in a glass Tupperware container. Both times it got moldy after about three days, and I threw it out. THIS time and went out and bought a fancy gallon glass jar with a lid sealable with a rubber ring, like a Ball jar. I added a splash of organic ACV to the water and filled it so that it is at least four inches of water over the feed. It's in the cool dark basement. Since I did that, I read another site on line and she said she makes hers in an old five gallon bucket with a dish towel waited down with a rock for a cover. AND keeps it in a WARM place, and it works out just fine. And people throw all kinds of stuff in it, including one site that said they use moldy feed! I'm not doing that, with the moldy feed, but which works best? I bought the fancy jar, by the way, because I figured if it doesn't work out this time, I'll just use the jar for something else. Also, I don't want to feed them the fermented feed all the time. I read it is better to just give once in a while, and that's what I'd rather do, as I don't want to mess with it all the time. So I wondered, how long can you leave it in there, before it DOES turn moldy? I just like the idea of it, because of the benefits, rather than worrying about waste. If we're careful, our flock doesn't waste that much.