50 Water Hardness Strips

SKU: 33813-Hard

$10.95USD or lower Each

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Hard water test strips measure scale forming calcium carbonate from 0-500ppm (0-30 grains/gallon) fast and accurately; only $10.95 for 50 strips.

How to Test Water Hardness?

Hard water is safe to drink but can leave an unsightly film on glass. Excessive water hardness can clog pipes or ruin your dishwasher. A film on glass is usually the first sign of a problem. Use these strips to confirm the degree of hardness in your water. It's as simple as wetting the strip & comparing to the color chart. It may not be as bad as you think (i.e.>0 but <50ppm). This is enough to tell you whether a water softener is needed, the one you own needs replacing or you just a top up of softener salt.


What is Hard Water?

Determining water hardness is simply a matter of how knowing much calcium and magnesium minerals are dissolved in your water. Of these, the most familiar is calcium carbonate (scale) which can be seen as a precipitate on clear glass, water jugs, shower heads, etc.

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.

Water Hardness ppm to gpg

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.

These strips can determine calcium levels in milk (usually done with cows or horses) but it is recommended you dilute the milk first with deionized water by least a factor of 10X. There can be interference from the fat/caseinate that could give incorrect readings if this is not done.

  • 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.
  • 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 Strip Documentation

Stability Statement Certificate of Analysis
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