Online Resources for the Filter Project |
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Resources |
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Filter Project - Macromedia Flash Movies, Materials, & Some Designs |
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Reflections (unedited student comments) |
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| Group 1 | Our problem was to disign a filter that can clean dirty water useing these items: activated carbon, cotton, sand, woodrod, iron, pixy cup, and plastic cups. It took $420 to get the meterials. (sic) | |||
| Group 2 | Our problem was to make a filter out of certain objects and we have limits to how many we can have. Our design was to have sand cotton mixed with carbon and then carbon. That was our design brief. We didn’t buy many things but we bought carbon 200$ sand was 20$ cotton was 50$ cups 200$ Dixie cups 10$ and hot glue was 20$ and all of it together was 495$. The cotton will collect any dirty things. The sand will slow it down and make the filter have time to filter it out. Rather than the water or any other liquids going threw really fast. The carbon is used to remove for odors tastes organic compounds and chlorine used all those things for that reason. Our problems were with the sand and the carbon. We had to clean the carbon and the sand and that would waste it. The cotton was easy to put in. our order of the stuff is sand cotton mixed with carbon and then more carbon. (sic) |
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| Group 3 | Our problem was that we have to build a water filter with only using activated carbon, sand, cotton, plastic cups, wood structural members, and hot glue. We used activated carbon to take away the bad taste and odor. We used the sand to take away the dirt and grim. And we used the cotton to help the sand to take out the dirt and things. We also used cups to catch the water and hold the objects together. Our problem was that the sand was getting through the holes in the bottom of the plastic cup. So what we did to fix it was we put cotton in the bottom of the bottom half of the plastic cut. This fixed the problem. We spent 345 dollars on our filter. (sic) | |||
| Group 4 | For our filter model/prototype we used Sand, cotton, 2 plastic cups, and activated carbon. The purpose of this project was to see what materials we could use in a certain combination to purify infected, polluted, and just plain old fashion dirty water and to turn it into clean drinking water for the people of the world with money and supply constraints. My group and I used approximetly 400 to 450 dollars. The purpose of the activated carbon was to get rid of odors, rotten tastes, organic filth, and chlorine that are polluting our natural water supply. The purpose of the sand is to filter the finer pullutients from the water. The use of our cotton provides a screen inbetween the multiple layers of our filter. The cups serve as the tanks in which the filter itself is held. (after testing) We discovered multiple errors with our filter and we kept spilling our filters materials. For example we used a hot glue gun to make holes and this caused the plastic to remold its self back together and cause the holes to close. (sic) |
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| Group 5 | Our problem was that we needed to make a filter that could clean water, make it non- conducting, make sure our water was not mucky, then to see if our flow rate was acceptable. With a limited amount of money and materials, our design was that we put four pieces of dowel rod on four sides of the cup. The ph of our water should be 7 because we used activated carbon & sand to help clean the water & cotton to get all the dirt out. We made our filter so there is already a cup at the bottom to make sure the water was collected and we could see the water was clean. Our filtered water was non- conducting. We had many problems like: making the filter cleans so the water did not come out black like the activated carbon. We also had problems with it spilling because of its unstable structure. Our water also conducted electricity at the beginning. Other than that we had no problems with our filter. We used a ½ a cup of carbon, 1 cup of sand, 1 cup of cotton, 2 plastic cups, 1 wooden rod &, 2 glue sticks. It all cost us all together $420. We learned that it is helpful to have a filter in the water system so the water will come out clean and it would be good to drink. (sic) | |||
| Group 6 | Our problem was to design a water filter using sand to remove big particls, activated carbon to neutralize the ph,cotton to make the water cleaner by removing particls and debris, plastic cups to trap the clean water, wood and hot glue. To remove particles neutralize pH and reduce turbidity capture the filtered water.i learned that we should have seperated the materials with cotton or paper (sic) | |||
| Three 6th Graders on the Project | This project was exciting and different from most projects because we actually created something than we are just studying something. This project was real fun because we got to do hands-on stuff which we don’t normally get to do in schools. This time we got to actually build our own filters and cleaned water and learned about the different layers and the materials that we needed to use and it was fun because we got to be creative and like we designed something ourselves and learned different stuff like cotton and sand and carbon absorb the stuff and arranged the material like cotton carbon cotton sand cotton gravel cotton and it made the water pretty clean but we had to do a few test runs so the water became clear. We learned the order in which certain things are supposed to go to make the water clear, we learned that the order in which it goes through from top to bottom was cotton carbon cotton sand cotton gravel cotton and you put the dirty water in and we had to run it a few times with water under the sink to make sure that the water didn’t get too dirty and then Mr. Bala took coffee and tea and mixed it together and we had to clean that dirty water. Most people passed three of the four tests and none of the people passed the turbidity test with the laser. | |||
Why Study Water - Students' Perspective |
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| Class 1 | Because water = money – economy of resource Sharing – with animals We need water to survive…without water, we would be dead In Africa, control of a river…countries were fighting over water We use water to water crops…we need water to produce food The major concern is what if we have a drought? The easiest water to get to is 0.01% of the water…if we are wasting it, there will be less to drink, for the animals to drink, there will be less water for plants, which supply air, if we waste all of the water…plants provide the air, they produce oxygen… If we waste all of our money on water, there would be no reason for construction workers to make houses… We only have 0.01% of water and if that’s all the water that we have that is fresh that we can drink, then it will cost all of the cities a lot of money to filter the ocean… |
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| Class 2 | We need water to survive… Because we are running out…we need to know how much we are using… We need water everyday…like to wash your car, to take a shower… It keeps plants alive… Without water we cant water the plants and we cant breathe without plants, carbon dioxide and we breathe out carbon dioxide and the plants breathe it in… |
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Students' Questions after Completing the Filter Project |
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| Class 1 | How do you design a filter to get a better flow rate? Does the amount of sand affect the flow rate? Would it help to spread out the materials so that the water would also be filtered and have a better flow rate? If there is just a little sand and cotton, flow rate goes up, but filtration goes down. Why? Does the order of the layers make a difference for filtration and flow rate? Bigger rocks held the cotton in better Did compressing the cotton make a difference? We used a vice to compress the cotton, when we let up the press, it uncompressed a little, but stayed tight. When we were buying it, we could buy as much as could fit in the cup and seeing the compressed cotton… Was there enough sand to filter the water? |
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| Class 2 | Who was the first to filter water? What if you a forgot to remove the fishies before you clean up the lake, if the lake got contaminated? What is the hardest thing to get out of the water? In Waneka, do you have to put more fish in there? What would happen to the fish if someone poured a bunch of coffee beans into the lake? Is there a season when the water gets more muddy? What can we do with Waneka to clean it up today? Why is the lake so green? What if you dump in too many chemicals, does it contaminate the water in any way? Is the water that comes out of the faucet healthier than bottled water? How did the earliest people know what materials use for their filters? Cause the water filters at the water treatment plant are so much larger, would they have a higher flow rate? If you miniaturize the plant filter, would it have the same flow rate? How many tests to you have to pass to drink the water? |
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