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Inaccurate water tests – or did I do something wrong after all?
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![HOW TO] Test KH in your Aquarium - JBL COMBISET - YouTube](https://i.ytimg.com/vi/BsMOEJUPFGo/maxresdefault.jpg "HOW TO] Test KH in your Aquarium - JBL COMBISET - YouTube")
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JBL PROAQUATEST KH Carbonate hardness
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JBL PROAQUATEST KH Carbonate hardness
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