sample of clean and dirty water

analysis background biochemistry biology blue bottle bottles brown chemical chemistry clean clear closed concept container containers contamination copy cut cutout detail dirty ecologic ecology environment environmental exam experiment expertise filtered filtering filtration flask flasks fluid fresh freshness full garbage glass glasses health impure indoor industrial industry isolated jar jars lab liquid measure measures nature nobody object out poison poisoned pollution protection purity research sample science septic space stopper studio test testing toxic two unclean unhealthy used waste water white