The effective size of sand particles for slow sand filters varies from -

[Dnyan Deshmukh]

The effective size of sand particles for slow sand filters varies from -

(a) 0.30 to 0.35 mm

(b) 0.35 to 0.50 mm

(c) 0.50 to 0.65 mm

(d) 0.65 to 0.75 mm.

The correct Answer Is
(b) 0.35 to 0.50 mm