API pH Freshwater Aquarium Test & Adjuster Kit, 250 count - Chewy.com
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Amazon.com : Aquarium Pharmaceuticals 30B pH Down Aquarium pH Adjuster, 16 oz., Model Number: 17163020301 : Aquarium Treatments : Pet Supplies
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Amazon.com : Tetra Correct pH Tablets 8 Count, For aquarium Water : Aquarium Treatments : Pet Supplies
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PH Meter for Water Hydroponics Digital PH Tester Pen 0.01 High Accuracy Pocket Size with 0-14 PH Measurement Range for Household Drinking, Pool and Aquarium (Blue): Amazon.com: Industrial & Scientific