In the water treatment plant different materials are used as filters. The most common been used is/are _____?
واٹر ٹریٹمنٹ پلانٹ میں مختلف مواد فلٹرز کے طور پر استعمال ہوتے ہیں۔ سب سے عام _____ استعمال کیا گیا ہے/ہیں؟
Answer: Sand and gravel
Explanation
Sand and gravel are commonly used in filtration to remove impurities and suspended particles from water.
They provide a physical barrier and are effective in both slow and rapid sand filtration processes.
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