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![[HOW TO] Test GH in your Aquarium - JBL GH TEST - YouTube](https://i.ytimg.com/vi/EEhFirCj4HE/sddefault.jpg "[HOW TO] Test GH in your Aquarium - JBL GH TEST - YouTube")
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JBL ProAqua Test GH General Hardness
JBL GH Test
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JBL GH Test
JBL GH Test
