Clean the Water
Water in lakes, rivers and swamps often
contains impurities that make it look and smell bad. The water also may
contain bacteria and other organisms that can cause disease. How can we
get this water clean enough to drink?
treatment plants clean water using some
See how water is pulled from Lake Mead and
treated at the water treatment facilities.
or all of the following processes:
with ultra violet light
It's your turn to clean dirty water. Follow the experiment
- A homemade filter (sock, cotton, paper towels, coffee filter,
- Cooking oil
- Clean water
- 2 empty plastic bottles - (1-liter soda bottles are okay but
one bottle should be clear)
- Dirt & grass
- Dish soap
- Fill one of your bottles half-way with water from the faucet.
- Put cooking oil, dish soap and some dirt
and grass into the bottle of water.
- Shake the bottle to mix the dirt around.
- Take the unused bottle and cut it in half. Rest the top half
in the bottom half (see diagram below).
- Grab your filter and stuff it in the
"neck" of the bottle you just cut.
- Pour the dirty water from the first bottle through the filter
on the second bottle.
- Does the water poured through the filter look cleaner?
It's not clean enough to drink, so don't try it!
- Compare the water you filtered to the
dirty water. How are they different?
- Can you get dirty water cleaner? How?
- How hard is it to clean dirty water?
- Share what you learned with your friends and family.