Lesson Three
Purpose: To determine thepurity of the filtered water you are
making.
Method: Pour a few tsp. of filtered water into a bottle or
plastic bag. Place your white blood cell specimen on one plate
and the water sample on the other. Listen to your circuit. Taste
your filtered water. After ½ minute, listen to your circuit again,
just as in Lesson Two. If it appears in your white blood cells at
any time you can conclude the water is not pure. You must have
pure water available to you before continuing.
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