[Double Venom]

Wetdog,

Knowing you as little as I do, I don't believe you of all people would ask this question?

I can't find a single fault with the listed posts.

Cooler: Wash and flush with acetone/lacquer thinner, boil cooler, then flush immediately with cold water under the highest pressure you can get.

Use an automotive paint filter-put the filter in a funnel, pour the water out of the cooler using the funnel.

Blow the cooler dry.

Now go back to the filter, take a magnet to the sides and the bottom-
Use a large magnifying glass and visibly inspect the filter again.

ANY metal, babbitt material, sell it on e-Bay! Better yet throw it away!

What let loose?