
All you have to do is remove the Water Hardness Reagent bottle from the test tube and fill the test tube from the cold water tap up to the 10mm mark. Remove the Water Hardness Reagent lid. Squeezing the bottle gently, add one drop at a time and mix between drops until the colour changes from red to blue. Be sure to count the drops, then multiply by 20 to give your water hardness reading.




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