Back

50 Water Hardness Strips

SKU: 33813-Hard

$13.95USD or lower Each

Save More When You Buy More!
Quantity1+2+ 3+ 10+ 
Price for each$13.95USD$13.80USD$13.60USD$13.05USD
Your savings - 1.08%2.51%6.45%
Qty:
[5]   1 Reviews    | Write a Review

Measure calcium and magnesium hardness instantly with Indigo® Water Hardness Test Strips. Ideal for lab, aquarium, industrial, and educational applications.

Water hardness is caused primarily by dissolved calcium and magnesium ions that affect water quality, scaling, and cleaning efficiency. Indigo® Water Hardness Test Strips provide fast, reliable measurements in seconds with no reagents or instruments required. These strips are widely used in laboratories, aquariums, boiler maintenance, and environmental education to assess hardness in tap, well, or process water.

Details Specs Docs Reviews
Details

How is Water Hardness Measured?

Water hardness is measured in ppm (parts per million) or grains per gallon. This describes the amount of dissolved calcium and magnesium in your water. Our water hardness test strips can measure 0-50-125-250-500ppm or 0-3-7-15-30 grains per gallon.

Degree of Hardness Grains per Gallon (gpg) ppm (or mg/L)
Soft <1.0 <17.0
Slightly Hard 1.0-3.5 17-60
Moderately Hard 3.5-7.0 60-120
Hard 7.0-10.0 120-180
Very Hard >10 >180

All water has a least some dissolved minerals and unscrupulous water softener companies will "prove" you have a problem by first putting drops in their "control" (distilled) water sample that will show no change but will elicit a reaction when added to your tap water. What you are seeing is a harmless iron precipitate but the effect can be dramatic.

Discipline Learning Outcomes / Key Uses
Chemistry Relate ion exchange reactions to water softening; analyze Ca²? and Mg²? equilibrium.
Biology Understand mineral availability and its effect on aquatic organisms and cell physiology.
Environmental Science Evaluate hardness as a water-quality indicator in natural and municipal systems.
Engineering Prevent scale formation in industrial piping, boilers, and cooling systems.
Education Demonstrate ionic concentration and titration concepts safely using colorimetric testing.
Specifications
  • The number of strips (50) vial is approximate.
  • Shelf life is 3 years but if bag is properly sealed, they should be good for a minimum of 5 years or more.
  • Strips will degrade if exposed to sunlight and come in a dark bag to prevent this. Do NOT transfer to a clear bag or strips will degrade quickly.
  • Test strips are made in USA & calibrated with NIST standards.
Documentation

Test Strip Documentation
Stability Statement Certificate of Analysis SDS
Indigo Water hardness test strips 0-500ppm Stability Statement Indigo Water hardness test strips 0-500ppm Certificate of Analysis Indigo Water hardness test strips 0-500ppm SDS
Reviews (1)
2023-08-10

I wanted to find out how hard the water here is, because some water is used with the HVAC condenser on the hottest days. My tap water is very hard - 500PPM was indicated. I knew the water was hard, but not that hard. By contrast, the "5-gallon filtered bottled water" from the self-fill machine at the grocery store showed "0" ppm hardness. It is obvious I will have to install a filter for the condenser water spray so that calcium mineral deposits do not build up on the aluminum coils. The purchase of these test strips was well worth it!

— Patrick
Review This Product Now!