Instructions of use: 1.- clean and fill up the bucket to the brand of 15 ml for the analytical. 2.- ADD 5 drops of reagent th-11, shake to mix. The sample will be for colour pink if there are total hardness. 2.- ADD drop to drop the reagent th-12, shake after every drop of add up from pink to blue. Count the drops. 4.- each drop is equivalent to 1 ºfh. Multiply the number of drops per 10. The resulting number will give you the total hardness expressed in PPM.
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