Social & Preventive Medicine In a slow sand filter, the element responsible for yielding bacteria free water is the A Risk of Guinea worm infection B Water is more than depth of 15 meter C Where no water source in a distance of 1.6 km from community D There is excess of Na+, K+, F+ salts 💡 Explanation In a slow sand filter, the element responsible for yielding bacteria free water is the ✓ Correct Answer: A. Risk of Guinea worm infection