25 questions and answers about a four-stage water purification suitable for students in Class 9 and Class 10
1. What is the purpose of the sand in the water purification process? 2. How does the sand filtration stage contribute to improving water quality? 3. Why is gravel used in the water purification process? 4. What role does the gravel layer play in the purification process? 5. How does the four-stage water purification process … Read more