Fishingadventure, I was hoping someone had done this with steel roofs. My neighbor used to have a downspout coming off their steel barn roof into a trough for horses. The water always had what looked like an oily film on top of the water, because of the oily looking film they stopped using it like that. I wasn’t sure it this would hurt my pond. Thanks for your feedback, I would much rather use my steel roof because it’s closer to my pond.

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