The methods include simple sedimentation in rural water supply schemes, slow sand filter plants installed at over a dozen places, rapid sand filter
plants in a few districts, an ultrafiltration plant in Nawabshah and reverse osmosis plants.
"Improvement of Performance of Rapid Sand Filter
using Coconut Shell as Capping Media "International Journal of Science and Research (IJSR) 3: 6.
This value falls within the range of slow sand filter (2.9 to 7.6 [m.sup.3]/d) and rapid sand filter
(120 to 235 [m.sup.3]/d) as mentioned by .
The effluent passed through a descending rapid sand filter
with a filtration rate of 120 [m.sup.3] [m.sup.-2] day to remove suspended solids.
A rapid sand filter
system developed by a researcher at the University of North Carolina (UNC) is efficient, inexpensive and low-tech.
The system consists of a gravity-fed settling tank, rapid sand filter
, and a solar-powered ultraviolet sanitation light.
The rapid sand filter
is a 400-plus-seat terraced amphitheater with a covered stage, dance plaza, actor's wing and storage area that will be available for use by community groups.
The greensand filter is similar to the conventional rapid sand filter
in both piping and media arrangement.
A conventional rapid sand filter
consists of a bed of sand about 24 to 30 in.