Just to elaborate on what Mark mentioned.

8 parts of bleach is about a 1/8 teaspoon which will disinfect clear water. Converesly, 16 drops is a 1/4 teaspoon which is reccommended for cloudy water. If you are not sure which is the right amount, then it is better to err on the higher dosage of bleach.

Some years ago, when my SO did NGO aide work overseas in some of the most impoverished countries on the planet. Then as now, it was not uncommon to treat water with even higher doses of bleach if there was any doubt on the effectivness of the standard 16 drops for cloudy water.