Pressure Sand Filter Specification
The principal of sand media filtrationis quite straightforward.
The irrigation source water is pressurized and introduced into the top of
the media tanks. A diffusion plate in the top throat of the tank serves to
reduce water velocity and distribute the water evenly across the top of
the media bed. The media bed is a layer of size-graded crushed silica
sand about 16 in depth. The contaminates in the water are captured in
the media bed and filtered water passes into the discharge manifold at
the bottom of the tanks.
Filtration Mode
sand media filtration are effective at filtering both organic and inorganic
contaminants. The large size and three-dimensional nature of a media
bed provides more surface area and has greater holding capacity than
many other types of filters. Determining filter capacity and understanding the backwash function (cleaning) of your system are among the
most important aspects of successful filtration. These operations and
more will be covered in the following pages.
The key to
superior media filtration is the effective removal of the
captured contaminates from the media bed, commonly referred to as
backwashing. Located in the bottom of every Flow-Guard Media Filter
is a highly engineered underdrain system that is designed to perform
two functions. First it must not allow any media sand to pass through
the filters and into the
irrigation system.
Second, during the
backwash operation it
must allow the flushwater to be evenly
distributed throughout
the entire media bed,
with no pockets or
dead spots. This
insures that the media
is lifted and uniformly
rinsed free of contaminants in an efficient
manner.
The Flow-Guard underdrain is made up of a series of stainless steel
wedgewire elements attached to a stainless steel spoke system that
covers the entire bottom of the tank. The large spoke system allows for
a better distribution of the backwash water to the individual wedgewire
elements. The wedgewire is effective in preventing media from entering
the irrigation system and by design does not get obstructed with media.
Covering the wedgewire elements is a layer of gravel. The purpose of
the gravel is to deflect the high-velocity backwash water and create a
very uniform flow, capable of gently lifting the media in the most
efficient manner possible. Efficient backwashing results in cleaner
media sand and shorter backwash cycles.
by: Shubham Inc.
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