AquaChek Hardness Test Strips for hot tubs & pools check total calcium + magnesium. Too low causes corrosion & foam. Too high causes scale & cloudiness. 25 tests.
- Total water hardness
- Low range (up to 120 ppm)
- High range (from 250 to 1,000 ppm)
Product Notes: Dip strip, remove, then compare to chart.
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