Biosand filter
Bio sand water filter.
If you want to know how to bulid, just read the following steps.
1. Get a big bottle, small ones look like sh**
2. Cut the top, of the bottle off. (keep the cap)
3. Make a hole the size off mine in the video.
4. Make a hole at the bottom of the bottle. (about 3cm high)
5. Put a straw in the hole
6. Put gravel in 1/4 of the bottle (small and big) small on top, big on bottem
7. Put like 2 peices of towell paper
8. Put sand 2/4 of the bottle, make sure its not toughing the top of the bottle
9. Put dirty water in the top
10. Have fun!!
Ps....when you make the hole at the bottem, IT WILL LEAKE!!!!