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
(a) 0.30 to 0.35 mm
(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
(a) 0.30 to 0.35 mm
