Phone: (519) 746-4761

Canadian Address:

169 Lexington Court, Unit I

Waterloo, ON, N2J 4R9


US Address:

Niagara Falls, NY 14305

Canadian/International ship from Waterloo; US orders from Buffalo, NY.

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50 Water Hardness Strips

Hard water test strips measure scale forming calcium carbonate from 0-500ppm (0-30 grains/gallon) fast and accurately; only $15.00 for 50 strips. Don't trash that water softener just yet until you try this simple test!

The water hardness level chart shows water hardness in ppm and grains per (US) gallon.

See Tabs below for more information.

SKU: 33813-Hard
Water hardness test strips, 0-500ppm (0-30gpg) ~50/pk

$15.00USD or lower Each

Save More When You Buy More!
Quantity1+2+ 3+ 10+ 
Price for each$15.00USD$14.40USD$13.80USD$12.90USD
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Hard water is safe to drink but even small amounts can be an annoying since it can leave an unsightly film on glass. Excessive water hardness on the other hand can be a major nuisance and in extreme cases can clog pipes or ruin your dishwasher. The appearance of film on glass or in standing water is usually the first sign of a problem. Use these strips to confirm the degree of hardness in your water and whether a water softener is needed or needs replacing; it may not be as bad as you think (i.e.>0 but <50ppm).

More importantly, it can help avoid an unnecessary expense. 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.

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


Note (1): The number of strips per pack or vial is approximately 50.
Note (2): If bag is kept sealed & stored in a cool dry place, they have a shelf life of at least 2 years.

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