I have tested copper after adding SB-02 some time ago. The tester indicated that it had a small amount of copper. As I did not apply other copper-containing drug in the treatment, the copper should be from SB-02
康仔 wrote: I have tested copper after adding SB-02 some time ago. The tester indicated that it had a small amount of copper. As I did not apply other copper-containing drug in the treatment, the copper should be from SB-02