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Glass Pearls Filter MediaGlass Pearls EnlargedGlass Pearls - Decorative use with spondylus shell
Filter Media - Glass Pearls
Product Code: 3427

15kg: £34.80 Inc VAT and delivery


15kg: £34.80 Inc VAT and delivery

Glass Pearls, manufactured from pure glass and offering much finer filtration than conventional media.
Suitable for domestic and commercial swimming pools, aquaculture, water treatment and industrial applications.

Pack size: 15kg

Size: 0.6mm–0.8mm (May be considered as an ultra close graded BS 16:30)

Description & Use:
Glass Pearls are manufactured from 100% chemically inert pure soda glass. Their size and shape provides the ability to filter out finer particles than conventional sand media.

Glass pearls are spherical and have a very close grading of 0.6-0.8mm which provides a dense homogeneous filter bed with minute but regular spaces between the particles. Unlike natural sands which have a more open grading, glass pearls allow for filtration of particles down to 3 microns (Three thousands of a mm) which is in the order of twenty five times finer than that achieved by conventional filter media.

The smooth spherical shape of the Glass Pearls provides for a low coefficient of friction resulting in efficient back washing requiring less water than conventional media.

Glass Pearls can be laid on a bed of conventional 2-3mm support gravel to protect the lateral or cone outlets.

Prior to ordering:
Check manufacturers’ installation instructions to ensure compatibility when replacing sand media.
The volume of media required will vary with make and capacity of filter, please check manufacturers recommendations.

Chemical Composition:
SiO2 >70%
Al2O3 2.5%
K2O 1.5%
CaO 7-12%
MgO 5.0%
Particle Shape Spherical
Effective Size 0.61mm
Bulk Density Approx 1.61kg.m3
Hardness 7 on Mohs Scale

Filtration for Non Filtration Specialists:
Pools, spas and ponds require water to be filtered (and as appropriate disinfected) to provide safe places for recreation and livestock. Poor maintenance can lead to clogged filters which can increase the risk of water borne infection.

Typically water filters contain clean closely graded silica sand often carried on a bed of filter support gravel. A pressure fed sand filter or "high rate" sand filter, which is generally located immediately after the pump will typically remove particles down to 10 microns in size (ten thousands of a millimetre).

Water is pumped under pressure into the top of the filter and leaves at the bottom. On the way through suspended dirt and debris in the water is trapped between the particles of sand.

Sand filters need to be cleaned regularly. By re-directing water back up through the sand bed and out to waste, accumulated dirt is flushed out, this is process is called back washing. Sand filters come with a valve known as a multiport valve to change the direction of water flow and to facilitate this process.

Sand media needs changing every three to five years, however, also be aware of a phenomena known as chanelling. This is where water cuts channels in the sand leading to a loss in filter efficiency an again will require the media to be replaced.

Glass Pearls offer a superior alternative to conventional sand media giving outstanding water clarity.

Price Promise:
All prices shown include VAT and Delivery to mainland locations in England, Wales and Southern Scotland - There are no hidden charges on checkout.

Product is supplied in an easy to handle weatherproof pack within a cardboard box and delivered by national couriers. Please advise during checkout or contact our office if you have specific delivery requirements or concerns.

Design Specify: Glass Pearl filter media from Specialist Aggregates.

Product Code: 3427

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