Just rinse them gently in clean seawater before using them in your DT. Copper doesn’t bind to plastic, you just need to rinse off any copper treated water.Hi Jay, I am currently using a sump in the QT and running copper. The sump contains some black sponges as filtration. After QT is over, would you say it's safe to use these sponges in the DT as they are already cycled ? Would there be risk of cooper leaching out of them in the long run?
Jay