Indion - Multigrade Filter
The INDION Multigrade Filter is a depth filter that makes use of coarse and fine media mixed together in a fixed proportion. This arrangement produces a filter bed with adequate pore dimensions for retaining both large and small suspended particles. This filter performs at a substantially higher specific flow rate than conventional filters. Specific flow rates of 15 - 30 m/h have been successfully obtained for treating waters containing 50 -25 ppm suspended solids respectively to produce a filtrate with less than 5 ppm.
- Higher specific velocity
- Raw water can be used for backwashing the filter
- Higher specific flow rate than conventional downflow filters thereby saving on space and cost
- Very little maintenance required
- Lower backwash water requirement
- In most cases, raw water can be used for backwash
The INDION Multigrade Filter is an ideal choice for all applications where a conventional sand filter is used. It is extensively used in side stream filtration of cooling water and in potable water treatment. It is ideal for filtration of clarified water. In addition it finds application in sea water filtration and in filtration of chemical solutions. For these types of filtration, rubber lined or epoxy painted filters can be offered.
One vertical cylindrical mild steel pressure vessel with dished ends, painted internally with anti-corrosive bitumastic paint and externally with a protective coat of red oxide primer.
- One set of internal water distribution and collection system
- One initial charge of filter sand and underbed
- material
- One set of frontal pipework and valves
- Two pressure gauges to monitor head loss across the filter
- One orifice board (optional) for indication wash water flow to befitted in drain sump
- Maximum/minimum operating pressure will be 3.5 kg/cm7g and 2.0 kg/cmJg respectively
- INDION Multigrade Filters are available from 600 to 3000 mm diameters