less and more
less and less
more and less
more and more
(i) and (ii)
(i)and(iv)
(ii) and (iii)
(ii) and (iv)
2 to 4
4 to 6
6 to 8
8 to 10
1 to 2 minutes
30 to 45 minutes
2 to 6 hours
2 to 6 days
does not require alkalinity in water for flocculation
does not affect pH value of water
increases pH value of water
decreases pH value of water