Activated Carbon Filter
Activated carbon (AC) is a natural material derived from
bituminous coal, lignite, wood, coconut shell etc., activated
by steam and other means, and each one have different adsorption
properties (e.g. bituminous carbon for high chlorine reduction
capacity). We also use various blends of carbon to achieve
specific water quality and contaminants reduction (e.g.
coconut shell carbon for "sweet taste").
Rapid Gravity Sand Filters
The rapid gravity sand filter is a type of filter commonly
used in municipal water treatment facilities. Rapid sand
filters use relatively coarse sand and other granular media
to remove particles and impurities that have been trapped
in a floc through the use of flocculation chemicals - typically
salts of aluminium or iron. Water and flocs flows through
the filter medium under gravity pressure and the flocculated
material are trapped in the sand matrix.
Rapid filters are usually built open with the water passing
down the filter but by gravity. It has a filter rate
of 4 – 8 m3/m2/hr. The tank is made of concrete with
a depth of 3.0 to 3.5m. Coarse sand of size 0.4 to 1.5mm
is used as the filter medium.
A screen filter is a type of filter utilizing a rigid or
flexible screen to separate sand and other fine particles
out of water for irrigation or other applications. Typical
screen materials include stainless steel (Mesh), polypropylene,