The purpose of this research is to know dosely the effects of the extract of pine apple peet« cayenne in killing the bacteria Eschericia coli in the process of disinfection of fresh water. The variations of dosages in the research are: Treatment 1,1000 mI of sampling water intervened by 100 mI extract of pine apple peels cayenne. Treatment 2, is 1000 mI of sampling water intervened by 250 mI e…