Amazon.com: RUNBO Water Hardness Test Strips,0
WATER HARDNESS TEST STRIP IS IDEAL FOR: water filter system, fish tank, laundry, cloth diaper, dishwasher, industrial processes, educational experiments, and for homeland security applications etc. LONG-TERM STORAGE: 100 Stripes In total. 50 in Bottle. 50 refills in sealed moisture-proof foil bag to ensure the stripes can be stored for 2 years.
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