3-5mm Filter Support Media

Drinking water quality Filtration Gravel - (Grade 3-5mm) A quartz based gravel used as a support layer under filtration sand to prevent clogging of filter nozzles and loss of media. Suitable for aquarium, natural pond, swimming pool and potable water filters.

This sand has been triple washed, kiln dried and graded.

Filtration for Non Filtration Specialists: Aquariums and ponds require water to be filtered 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 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 backwashing and the sand media needs changing every three to five years, however, also be aware of a phenomenon known as channelling. 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.