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Amazon.com : API GH & KH TEST KIT Freshwater Aquarium Water Test Kit, 2.5 oz. : Aquarium Test Kits : Pet Supplies
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Amazon.com : Freshwater Aquarium Test Strips 6 in 1 - Fish Tank Test Kit for Testing pH Nitrite Nitrate Chlorine General & Carbonate Hardness (GH & KH) - Easy to Read Wide
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Amazon.com : API GH & KH TEST KIT Freshwater Aquarium Water Test Kit, 2.5 oz. : Aquarium Test Kits : Pet Supplies
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Amazon.com : API GH & KH TEST KIT Freshwater Aquarium Water Test Kit, 2.5 oz. : Aquarium Test Kits : Pet Supplies
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