Removing copper from old rocks

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kvansloo said:
Wouldn't it be better to run the saltwater through a 2 canister DI unit 1st canister from pump has DI and 2nd has 1 micron carbon and let it rip for a few days.
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If you run salt water through a di, it comes out as fresh water and rapidly depletes the di.
 
Saltwater Aquarium

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