Can't get rid of copper

[Randy Holmes-Farley Verified Community Expert]

Hi Randy, Yes, it's zero. Looks like i had a bad tester from Hanna. Here are the rest of the results.

	UNWANTED HEAVY METALS	ANALYSIS	SETPOINT
Hg	MERCURY	0 µg/l	0 µg/l	▲
Se	SELENIUM	0 µg/l	0 µg/l	▲
Cd	CADMIUM	0 µg/l	0 µg/l	▲
Sn	TIN	0 µg/l	0 µg/l	▲
Sb	ANTIMONY	0 µg/l	0 µg/l	▲
As	ARSENIC	0 µg/l	0 µg/l	▲
Al	ALUMINIUM	62 µg/l	0 - 60 µg/l	▲
Pb	LEAD	0 µg/l	0 µg/l	▲
Ti	TITANIUM	0 µg/l	0 µg/l	▲
Cu	COPPER	0 µg/l	0 µg/l	▲
La	LANTHANUM	0 µg/l	0 µg/l	▲
Sc	SCANDIUM	0 µg/l	0 µg/l	▲
W	TUNGSTEN	0 µg/l	0 µg/l	▲

Lots of folks seem to get substantial readings with the Hanna copper tester that do not show up by ICP. Not sure what the issue is.

 

[aquaticlog]

This has been my issue as well, my Hanna Copper HR registers 0.02 ppm on freshly mixed Reef Crystals