Operation Water Drop Crossword Puzzle and Answer Key. Across 1: 1 A grayish hard white metal that resembles iron. Down 2: A measure of the ability of your water to resist changes in pH.
Results: Since there is no Canadian Drinking Water Guideline for Ammonia you will compare results to the European Union limit. The standard should give a result very close to the 0.5 mg/L colour; if the colour is darker then it DOES NOT meet the guidelines.