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Stock up on reagents and refills at Grainger to complement your water testing instruments. Find tablet reagents to help measure total and free chlorine; liquid reagent refills to help test water hardness; iron ferro, potassium iodide and other reagents for use with your colorimeter and more. Also find electrode cleaning kits, test refill kits for your nitrite meter and much more. Shop Grainger today for reagents and refills to help maintain adequate supplies.Close

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