the.com/filtration
nature's bouncer, deciding what gets through and what gets stuck at the door
kidney quotaYour kidneys filter about 180 liters of blood daily
sand magicSlow sand filters use a living microbial top layer
coffee originThe paper filter was invented by a German housewife in 1908
size mattersMembranes can block particles smaller than a virus
liver tooYour liver filters toxins your kidneys can't catch