100% brand new and high quality Features: Experimental device can purify turbid water into transparent and clean water. After the filter layer by layer, the water changes from turbid to transparent. During the experiment, children can observe the filtering process of different substances, feel the origin of clean water, and experience unexpected surprises. Through experiments, explore the origin of "clean water" so that children can learn scientific knowledge of water and cultivate environmental awareness during the experiment. Bulk accessories, easy assembly, improve your kids hands-on ability and problem solving skills. Reminder: The filtered water is only for demonstration, please do not drink it. Specification: Material: Plastic Color: As pictures shown Size: app.30x7cm/11.81x2.76in Suitable age: more than 10 years Quantity: 1set Note: No retail package. Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package includes: 1 x crushed granite 1 x porcelain sand 1 x activated carbon 1 x quartz sand 1 x saleratus 1 x potassium alum 6 x filter paper 2 x sponge 1 x plastic cup 1 x plastic cover 1 x plastic hopper 1 x filtration tube 1 x manual(other accessories demo in the picture is not included.)