I just had a thought about your PVC chicken feeder. Yours is white, but I see a lot of feeders using black ABS pipe. I'm gonna guess that the black ABS pipe gets a lot hotter and has less issues with moisture accumulation. Maybe you need to paint yours black or switch to black ABS.
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Go to www.naturaldream.com they have a simple plan. The bees are bad this year. I had them on poorbottom.