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· Registered
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I have the same AP kh and gh kits and I just realised that my gh kit is doing exactly what your kit is doing. I believe they are no good. The color of the solution is dark green and the solution stays green. I know I have hard water. You can check the date on the bottle. I think the expiration date is 3 years after the printed date. I think you can rest assured that your water is fine.

Steve Pituch
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