Jamie, age 9 of Mesa, AZ wrote:
actuely I did it in school and it was awsome im going into 5th grade

Elise, age 10 of Norfolk, MA wrote:
It came out kind of clear. I didnt drink it.

Tori and Bity, age 13 of Fargo, ND wrote:
We had to do this for I and I in school. It worked great thanks for the idea.

Jalil, age 12 of Philadelphia wrote:
When I poured the water and oil through the sand the water came out crystal clear and all the oil stayed on top of the sand. I't was cool

Emily, age 10 of Ontario wrote:
I did't have all the suplies needed so,,,, I took a cup and put some filter paper over the top. I didn't have any gravel so I used beeds insted, I put the beeds on so that they were spred out over the filter paper. Then I placed the the cup in a bowl so that it wouldn't make a mess because some of the dirty water would go over the sides. When I checked the bottem of the cup the water was clean! I would probaly NOT drink it though!

Salena, age 13 of Fontana, CA wrote:
i changed it up a it I combied all three materials and it worked okay.

Bayan, age 14 of Oak Lawn, IL wrote:
It was about 2 years ago when I seen this experiment. I did it for my science fair project in 6th grade and I won OUTSTANDING!!! I was so amazed. I changed it up a little bit. Here are the things I did not use: sand old socks or scissors or cotton this is what I used, I used a bandana VINIGAR! Also everything else but instead of scissors I used a nail to poke holes in the cup. Vinigar was the main ingreadiant I acually worked better than the sand. you should try it but do not drink the dirty water!!

Ali, age 10 of Gahanna, OH wrote:
The cotton balls made a trap for everything so it was clear healthy water

Salvador, age 16 of Juno, AK wrote:
I struggled at first, but then clean water came out!!!

Farah, age 12 of Halifax, NS wrote:
It worked great!! I used cotton balls, filter paper, gravel and sand in that order and the water became so clean and pure I used it for my science fair!

Madisyn, age 9 of Emporia, KS wrote:
It got clear and drinkable!

Lucas, age 11 of Saratoga, CA wrote:
The water was completly pure! I asked my dad to see iff it was completely pure but he said there were some microscopic bacteria left and I shouldn't drink it.

Casie, age 11 of Philadelphia, PA wrote:
It turned out clean!!!

San'Tiece, age 13 of Owasso, OK wrote:
The project was cool! It really worked! The water was very clean and clear!

Annie, age 15 of St. Bruno, QC wrote:
Hey, In my science class at school, we are learning about water purification systems, and I have some advice for you guys. Don't drink the water!! Even though it looks clear and clean, there are still microscopic bacteria in the water that can't be filtered out. The water can get you terribly ill.

Vanessa, age 14 of Miami wrote:
It was amazing! The water turned Clear and I did five Trials. I used different Layers and I used rocks, leaves, and cotton balls Instead. The cotton balls, leaves, and rocks in that order were clearer than ever.

Rachael, age 15 of Gettysburg, PA wrote:
I added clean cotton balls, pebbles, gravel and sand. Then I got clean water when I put dirty water into my filter.

Storee, age 13 of Mitchell, AL wrote:
When I used this it worked so good!! I mean a gave my whole family a drink! Even my cats liked it. It worked sooooo good. Trust me! Try it.

Fatemah, age 11 of Chicago, IL wrote:
It was nice and clean!

Mike, age 9 of Markham, ON wrote:
I did it with only rocks and cotton balls and I drank it and it was compleatly clean. I tested it with the salt tester thing and it had no salt or dirt just pure water!!!

Jessica, age 11 of El Paso, TX wrote:
I had done this before at school and it did look clear but there was stil salt in it. Another way to find out if the water was clear was to evaporate the water to see what was left behind.

Nala, age 9 of London wrote:
It took a long time to make the water clean but in the end it worked.

Sagrario & Crystal of Bronx, NY wrote:
I did this for my science fair project. I got an A+. When I did it the water tasted so pure. I was better than my filtered water. But the water came out with some coclor because I used sand and gravel. The gravel is what gace it color.

Lena, age 13 of Paterson, NJ wrote:
When I tried it, the rocks and dirt were just soked up by the cotton balls! It was an amazing sight to see!

Kati, age 10 of Worcester, MA wrote:
It worked perfect on my first try I mean I cant believe! First I put3 paper towels down and then I put some big rocks alittle biger then the ones you use then I put another paper towel down ans it worked.

Erica, age 12 of Twin Falls, ID wrote:
Instead of using a bandana I used the leg of a pair of jeans. The water come out as clean as spring water. Then I used the salt water tester and there was no salt in it once so ever!

Michelle, age 12 of Bronx, NY wrote:
I used this for a science project and it worked great! I tried using sand, an old sock, a ripped up shirt, and some gravel. I tested each one on it's own so I could see which one worked the best, the sand and the shirt didn't work that well. After a couple of times it worked! I compared it to regular tap water and the filtered water tasted a little better!

Michelle, age 13 of Toronto, ON wrote:
When I had to do this for a science experiment in class I tested ssooo many things to find out if they would all have worked. Sureley the more solid materials worked except for plastic. I learned that the material had to allow the water to go through it first!

Christy, age 13 of Morganton, NC wrote:
I did this experiment as a Science Project at school. I made three different filters. The one that worked the best was the one with cotten balls, bandana, and sand. I used different materials then the ones you guys used on the show and in different orders that the materials where placed in the cup. I made it to the school science fair!!!