Pressure Sand Filter Specification

Pressure Sand Filter Specification

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.

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