Premium quality fully rounded and washed riverstone pebbles, closely graded to create support gravel suitable for industrial, aquaculture and public swimming pool water filters.

Pack size: 15kg

Pebble Size: Approx 14-20mm

Description & Application:
Premium quality fully rounded and washed riverstone pebbles, closely graded to create support gravel suitable for industrial, aquaculture and public swimming pool water filters.

Note: This is primarily an industrial product and unlikely to be specified as a support gravel for ornamental pond and domestic swimming pool applications.

Prior to ordering:
The volume and size of support media required will vary with make and capacity of filter, please check manufacturers recommendations.

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 by 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 and again will require the media to be replaced.

* Specialist Aggregates' Price Promise:
All prices shown include UK VAT and delivery to 90% of UK locations - Read More. - There are no hidden charges on checkout.

We export throughout Europe and Worldwide - please enquire for shipping rates.

Quick Contact:
WhatsApp your enquiry and images to 07484 022898

Rocks in a Box^™ For protection and security your product will be shipped in a weatherproof pack within our easy-to-handle double walled cardboard box.

Boxes are delivered by national couriers. Please advise during checkout or contact our office if you have specific delivery requirements or concerns.

Both the inner plastic pack and the outer box can be recycled via normal household or industrial/commercial collections.

Architect Specify: 14-20mm Filter Support Gravel from Specialist Aggregates

Product Code: 2404

Order Online Now or Telephone orders Welcome - 9.00am to 5.00pm Monday / Friday