Work in pairs and invent a filter to purify water from bacteria and turbidity, which can be made from materials

Work in pairs and invent a filter to purify water from bacteria and turbidity, which can be made from materials and objects available in the hardware store.

Mix crushed carbon tablets and a tiny granule of potassium permanganate, mix, place between two layers of cotton pads.

Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.