Pumice Filtration Media


Pumice Filtration Media has been used worldwide for many years in the treatment of seawater, Potable Water and Wastewater. Pumice is a very versatile filtration media and is widely used in applications ranging from desalination/desalinization filtration, seawater reverse osmosis treatments SWRO (pre-filtration for MF, UF, NF and RO membranes) and potable water filtration.


All pumice filters employ the same basic principle; a rapid gravitational filtration of raw water through a granular media. Pumice filtration media can be used in single, dual or multi media filters in conjunction with sand and gravel depending on the quality of water to be treated. The versatility of pumice filtration media enables it to be used to solve difficult filtration problems. Filtration can be achieved within a rapid gravity or pressure filter, with optimum filtration performance ensured through regular backwashing via nozzles in the filter floor.


Advantages of using Pumice Filtration Media

The advantages of using pumice filtration media over conventional granular filter media are:


Reduced pressure loss through the filter; the unique nature of pumice allows increased solids retention capacity, higher particulate loadings and therefore much increased filter run times without a deterioration in filtrate quality.


Reduced headloss; this filtration in depth avoids the build up of particulates within the top section of the filter bed reducing headloss across the filter.


Reduced backwash rates; pumices lightweight nature (approximately 400kg per cubic metre) means lower backwash rates are needed to fully expand the filter bed. This generates substantial savings in the operating costs of the filtration plant as backwash consumption requirements are typically 30% lower than using traditional media.


Increased bed expansion; the lightweight nature of pumice filtration media gives increased bed expansion over traditional media using the same backwash rate. Again this generates substantial savings in energy and water usage, which equates to a reduction in pumping requirements and enables a downsizing of the filtration plant.


Can be used at elevated temperatures; pumice can be used at temperatures ranging from 0-40 degrees celcius.


Can be used in saline or fresh water; pumice has been proven to work successfully in saline or fresh water conditions.


High filtrate quality; pumice filtration media is also used when extremely high quality filtrate is required and can remove suspended solids down to 10 microns.


Applications for Pumice Filtration Media

Desalinisation / Desalinization; pumice filtration media is used in the pre-treatment of saline or brackish water prior to desalination. This preliminary treatment removes the coarse particulates prior to the next stage of treatment typically a membrane filtration process.


Seawater Reverse Osmosis and Reverse Osmosis; seawater reverse osmosis (SWRO) and reverse osmosis (RO) are desalination processes that produce potable water by forcing pre-treated seawater against a semi-permeable membrane, producing pure water on one side and concentrated brine on the other. The brine returns to the sea, while the potable water is stored or distributed for human consumption.

Desalination plant - UF membranes


Potable Water Filtration; pumice filtration media is widely used in multimedia filters to treat potable water intended for human consumption. All our pumice filtration media has British Standard approval (BS EN 12906-1999) and UK Drinking Water Inspectorate approval.

Additionally our pumice filtration media is NSF-61 approved and meets all the chemical and physical testing requirements for AWWA B-100 and DIN EN 12906.


Typical Grades

Pumice Filtration Media No.3 0.2 – 0.5mm
Pumice Filtration Media No.5 0.8 – 1.3mm
Pumice Filtration Media No.6 1.2 – 2.4mm
Pumice Filtration Media No.8 2.0 – 3.5mm



Further information

For further information on pressure drops, flow rates, bed expansion, packaging or pricing please feel free to contact us at: water@pumicefiltrationmedia.com. Or for further information on our range of pumice filtration media please follow the link: Pumice Filtration Media.



If you would like further information or details on where our Pumice Filtration Media has been successfully used please do not hesitate to contact us at: references@pumicefiltrationmedia.com.

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