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ACO Test Strip GH Testing Gray


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Any ideas why hardness is gray?  I've seen other threads that it will turn pink after a GK of 300... does it go gray after that?  I'm usually in the high end of hard water, so I guess my concern is that my water didn't crash below soft.



Edited by Allan
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On 10/17/2023 at 10:24 AM, Allan said:

I've repeated the test with the same results

If you're getting the same results on multiple strips it's very likely that your water is just off the charts hard. Not necessarily a bad thing, but that's kind of what it looks like to me. 

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