APSC AE WRD 2019 PYQ: Swimming Pool Water Treatment

Swimming Pool Water Treatment

Question: Swimming pool water requires

(A) Prechlorination

(B) Super-chlorination

(C) Dual chlorination

(D) Dechlorination

✅ The correct answer is: (A) Prechlorination

📌 Explanation

Swimming pool water requires prechlorination as an initial treatment to disinfect the water before it is used or circulated. This process involves adding chlorine to eliminate pathogens and prevent algae growth, ensuring the water is safe for swimmers from the outset.

📌 Related Information

• Prechlorination is often used when filling a pool or during initial treatment to establish a baseline disinfectant level.
• After prechlorination, routine chlorination maintains residual chlorine levels (typically 1–3 ppm) to ensure ongoing water safety.

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