Water Hardness Test Strips from William’s Brewing. About: “Package of 50 white plastic-backed paper test strips with instructions and a color chart. These read total hardness from 0 – 500 parts per million. A good way to see how much total hardness your water has before deciding whether to add gypsum (gypsum adds about 163ppm of hardness per teaspoon when added to 5 gallons).”
As of this posting, William’s Brewing has these marked down $10 to just $4.99. Check out the product page for current price and availability.
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