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Ok that's interesting. I guess we just have to chalk those up to the difficulties in using colorimetric tests.I have a hanna portable photometer for copper testing. I did 3 tests by adding 1.25ml to 1 gal (5ml for 4gal) and tested and got average of 1.15 like stated above. Then to be sure I did a full 5ml to 4 gal and got similar but slightly lower at 1.12.
Only did 1 test on 4 gal.