Anaerobically treated effluent has MPN of total coliform

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Anaerobically treated effluent has MPN of total coliform as 10⁶ /100 ml. After chlorination, the MPN value declines to 10²/100 ml. The per cent removal (%R) and log removal (log R) of total coliform MPN is

1. %R = 99.90; log R = 4
2. %R = 99.90; log R = 2
3. %R = 99.99; log R = 4
4. %R = 99.99; log R = 2

Correct Option: C

NA