AquaChek Total Hardness Test Strips for spas & pools measure calcium and magnesium, the 2 primary minerals of water hardness. Low hardness can be corrosive to a spa's metal components and can cause foam. High hardness causes scale and cloudy water.

• Total hardness
• Low range (up to 120 ppm)
• High range (from 250 to 1,000 ppm)
• 25 test strips

Product notes: Record test results in our Spa Log Book (below).