I bought some barrels for my pond filter. SO how do I wash them to make sure
they are fish safe? They were supposed to be food safe, but who nows.
Although they are the same shape, they did not have the same contents.

I was going to Pressure Wash them, soak in water and bleach, (2 days), add
baking soda for a bit and wash again. Perhaps with a does of dechlorinator.

Any other thoughts?