Condensation is caused by the container being colder than the surrounding air or feed in your case. Just a few degrees makes all the difference. Even a 40 watt incandescent bulb inside a metal container will do.I have used several varieties of feeders. From rubber livestock tubs I already owned, to the standard round, galvanized hanging feeder to Kebonix & Rent A Coop pvc ported feeders in different sizes.
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In some instances, I fed on the ground - figured what they missed or scratched under ok, as both drew bugs up & fertilized the "ground". I was feeding in tractors that moved through the yard & in 3 ×13' raised garden beds.
When I do have larger coop & runs, would like to do ported bins, but ...
In 2020, I noticed another issue popped up. Didn't matter what feed - horse/pony - pelleted feed w/ additives , alfalfa pellets, dry beet pulp shreds, a Sr mix feed w/ some molasses - stored in pony shed in the shade in galvanized or Rubbermaid trash cans. Duck feed pellets or "kibble" - stored in smallish galvanized trashcan or 5 gallon buckets next to pen outside (yes, sun & rain exposure). Chick starter crumble - Rubbermaid trash cans or 5 gallon buckets - in feed shed or under carport. All Flock - out in pony shed or barn; in 5 gallon buckets next to tractors in front yard that had some sun exposure. I had way reduced pony #s, no full size horses, a handful of ducks & also reduced #s of chicks, juvenile & mature chickens. Most if not all containers were "sweating". Then the feed around edges started clumping. Then molding. It happened w/ all the feeds - even the beet pulp shreds!
It also happened in the PVC ported feeders - different lid styles. Didn't matter if hung out or under a tarped roof.
I've used galvanized & Rubbermaid trash cans since 1995 for horse feed in MT (Cans stored outside strapped outside of feed pens/pasture w/ lids strapped tight), horse feed in southern NC since 1997 in 2 different barns before moved here in 2014. Chicken & ducks since 2011. Never experienced this before.
As I get chicks again now, i am replacing all the 5 gallon buckets. I don't want to replace any galvanized or Rubbermaid trashcans unless they are compromised... How worried do I need to be?
I did not usually have problems w/ ants or bugs. On occasion when I did, that feed went into compost, container completely washed, bleached & dried in sun before refilled w/ fresh feed. Area where that trashcan had been stored sprinkled w/ ant killer or later a combo of grits & DE. Usually worked & no issues for a long time. Barn & shed feed cans set up on pallets. Trashcans, some buckets outside set on cinder blocks. Not a lot of photos.