Sand filters are the oldest and most basic form of water filtration and originally consisted of large volumes of sand through which water simply percolated. Modern systems however now include various media layers which allows much more efficient filtration in smaller vessels.
Multi-media sand filters normally consist of three media layers (ie. support base gravel, micro screened sand and anthracite) and are a very economical means of primary filtration to remove the bulk of suspended solids. They are particularly efficient on surface waters for the removal of grit, sediment, turbidity and organic matter but also widely used on oxidised iron ('rust') and other precipitated contaminants such as manganese or scale particles.
Multi-media filters are periodically backwashed (either automatically or manually) by simply reversing the flow and this flushes to waste the accumulated sediment and also regrades the filter media layers.
Operation and maintenance is extremely simple. After initial set-up, the system is virtually self sustaining. With the Performa Head, back-flushing and clearing of trapped contaminates occurs automatically.
Main parameters
Rate of filtration:7~10m/h
Inlet NTU:≤15mg/L
Out NTU:≤5mg/L
Working temperature:normal temperature
Working pressure≤0.4Mpa
Height of filter media:1000~1200mm
Air flow F.A.D for backwashing:18~25L/ m2.S
Aircompressor.Max. Pressure:1~2kg/cm2
Backwash compressed air flow:15L/ m2.S(single floor),
12L/ m2.S(double floor)
Time of backwashing:5~10 minutes
Technical parameters sheet for Shallow Sand Filter (Bypass Filtration Sand Filter)
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