Experimental apparatus can purify cloudy water into transparent and clean water. After filtering layer by layer, the water will change from cloudy to transparent. During the experiment, children can observe the filtering process of various substances, investigate the origin of clean water, and experience unexpected surprises. Through experiments, investigate the origin of "clean water", so that children can learn scientific knowledge about water and cultivate environmental awareness during the experiment. Caution! The filtered water is for demonstration only, please do not drink it. Contents of the science kit: 1 x Porcelain sand 1 x Activated carbon 1 x Quartz sand 1 x Saleratus 1 x Potassium alum 6 x Filter papers 2 x Sponge 1 x Plastic cup 1 x Plastic sleeve 1 x Plastic funnel 1 x Filtration tube 1 x Manual Suitable for children aged 10+.