Removing copper from old rocks

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.

If you run salt water through a di, it comes out as fresh water and rapidly depletes the di.
 

IF YOU HAD TO TAKE A REEFING EXAM, WOULD YOU PASS?

  • Yes!

    Votes: 32 45.7%
  • Not yet, but I have one that I want to buy in mind!

    Votes: 9 12.9%
  • No.

    Votes: 26 37.1%
  • Other (please explain).

    Votes: 3 4.3%
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