I was alerted about this from another YouTube video where he mentioned a family with back yard chickens who were tested with high amounts of lead in their blood. The culprit was lead leaching from those black rubber feed bowls, then being passed thru the eggs into the family.
I tested one of my bowls which was empty in my coop until it rained today and it caught about an inch of water.
The video is linked here.
I used standard well water test strips and got a reading of 30 mg/L. Per the EPA the Alert Level is 0.015 mg/L.
My results were 2000 Times the EPA Limit.
I encourage you to do your own testing and report the results. I would also encourage you not to use these bowls for watering any of your animals.
Please share this info, and I can't believe these items are being sold almost everywhere.