Lenntech Water treatment & purification Lenntech Water treatment & purification

Multimedia (sand) Filtration Calculation

Please fill in the flow and the filter bed speed.

*recommended range of Filter Bed Speed (m/s) is [10,30]

A : Surface Area [m2] :

D : Diameter of Filter [m] :

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The above multi-media filtration calculator calculates the diameter of a round multi-media filter (MMF) based on the filter bed speed as input. For industrial water filtration purposes vertical filter bed speeds (ideal service flows) varying between 10 m/h and 25 m/h are used depending on the quality of the to be treated water. The higher the total suspended solids (TSS indicated in mg/l) content or the more turbid the water, the slower the vertical filter bed speed. Suspended solids consist of small particles such as silt, clay, grit, organic matter, algae and other microorganisms. Some advanced filtration media can still efficiently filter water at higher speeds, contact us for these applications. In private swimming pool water treatment filtration bed speeds of up to 50 m/hour are used. This is not recommended for industrial applications. Higher flow rates can prevent particles from adhering to the media granules or can dislodge particles that were previously retained. These filters are called multi-media filters because they contain different layers of filtration media ordered in decreasing porosity. Multi-media water filters are able to trap and retain a far larger number of particles (generally down to 10-25 microns) than traditional sand filters before backwashing becomes necessary.

For more information on filtration media (quartz sand, anthracite coal, garnet, birm, support gravel etc) click here: https://www.lenntech.com/products/filtration-media/filtration-media.htm

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