Gravel Silica / Crush Stone / Quartz Pea Gravel / Filtration Media

River gravel is locally sourced and a beautifully smooth rounded multi natural coloured stone. They are a perfect blend with just about everything in your garden, making them a popular choice for driveways, pedestrian pathways, gardens, courtyards, as an in-organic mulch, top of pot and planter box decoration or any design feature requiring a product of natural beauty. They look beautiful wet or dry. Gravel can also be used for exposed aggregate applications; mortar and concrete mixes. For pedestrian pathways this smaller 10mm grade is preferred by many as this provides a more stable footing to walk on.

Details	Information
Size Range	Pebbles (4–64 mm), Cobbles (64–256 mm), Boulders (larger than 256 mm)

Filtering Media

Filter Gravel is an extremely effective filter media because of its ability to hold back precipitates containing impurities. Filter sand size, angularity and hardness are the important filter characteristics to ensure proper filtering. Products meet or exceed the NSF/ANSI Standard 61 for Drinking Water System Components, as well as AWWA Standard B100-01.

Water Filtration

Sand filters are used to treat drinking water in many developed as well as developing countries. They work by using a complex biological film that grows naturally on the surface of the sand. The grading of the sand in filter beds is the most crucial element of any filter plant, determining functionality and longevity. Preferred due to low energy requirements and robust performance.

Filter Gravel – Standard Ranges

No.	Size (mm)
1	2.00 – 3.50
2	3.50 – 7.00
3	6.70 – 13.20
4	13.20 – 20.0

Salient Features

• 100% Silica Quartz with very minor impurities.
• Specific gravity 2.63 (higher than required 2.5).
• Higher weight prevents material loss during back washing.
• Hardness coefficient around 7.5 (prevents abrasion).
• Cubical particle shape for better interlocking and filtration efficiency.
• Very consistent grading within specification range.

We have the capability to produce and supply any grading according to the project’s unique filtration requirement. In the past we have produced sand and gravel with varying grading for several different projects.