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Project title Solar Water DisinfectionFeatured science projectScience project video
Difficulty Level High school
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To determine the relationship between the degree of disinfection of drinking water (infused with a bacteria culture) and varying degrees of opacity of the container 

Instructions preview
1. For this experiment, the independent variable is the opacity of the bottle. The dependent variable is the quantity of E.Coli colony present in the water. The controls for this experiment are the source of water used, the amount of sunlight exposed to and the amount of E.Coli used in each bottle. 2. Prepare 7 clean PET bottles for the experiment. 3. Using the sharp object, scratch the outer surface of 4 bottles to four different levels of opacity. They should be about 25% opaque, 50% opaque, 75% opaque and close to 100% opaque. 4. Scratch another bottle to .....
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