To make one, clay is mixed with a material that burns.It could be sw sawdust or agricultural waste like grain hosehulls, coco cocoa or coffee shells.Pine needles can also be used.

• 制作一个净水器，需要将泥土和易烧的材料混合在一起，这可以是锯屑或者农作物的废料，比如谷壳，可可或咖啡壳，也可以使用松针。