50 Water Hardness Strips

SKU: 33813-Hard

$10.95USD or lower Each

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[5]   1 Reviews    | Write a Review

Indigo® 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. Excessive scale buildup can clog pipes, ruin your dishwashers & hot water tanks, interfere with hospital dialysis machines or compromise food production.


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.

  • 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 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)

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
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