On Tuesday we made water filters.  A water filter is when you get dirty water and clean it. Here are the steps.

First you get a plastic bottle and cut off the bottom.  Secondly, you jam a little bit of cotton wool into the bottle neck. Next  you fill the bottle half full with sand. After that you put clean gravel on top of the sand. Then you place a beaker underneath  the bottle and pour dirty water  into the bottle.   As the water passes through the filter it comes out  much cleaner.