3) a. Manufacture of filter paper is a indirect water use because of the water needed to produce and transport the paper.
b. Premoistening of the sand and gravel is a direct water use because we directly put the water on the sand ourselves.
c. Use of water to cool the distillation apparatus is a direct water use because again we are using the water directly to cool the distillation apparatus
4) Purifying water means to remove all the dirt and impurties to produce clean and clear water.
5)Three techniques to purify water are oil-water separation, sand filtration, and charcoal absorption and filtration.
6) In the oil-water separation the oil was removed, in the sand filtration the solid particles were removed, and lastly in the charcoal absorption and filtration the color and and most of the odor was removed.
7) a.The foul water procedure can't convert seawater to water suitable for drinking because it doesn't completely remove all the small particles.
b. An addition purification step is distillation, which would allow seawater to be suitable for drinking.
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