Opta Waive
Water Filtration Products

Water Filtration

Opta Minerals is a world-leading supplier of water filtration products, including:

Find out more about multimedia filter application.

Excerpt from “Introduction to Water Treatment – Volume 2” (AWWA)
...Dual- and mixed/multimedia filters have a coarse-to-fine gradation of filter media. By using fine media with a high specific gravity and coarse media with a lower specific gravity, the layers of media approximately maintain their respective positions in the filter bed even after backwashing. Some mixing does occur. Mixing actually makes the filter more effective by providing more contact area for the suspended particles.
In operation, the coarse layer on top removes larger suspended particles. The finer particles pass through this layer and are removed by finer media below. As a result, most of the filter bed is used to remove suspended particles. This allows for longer filter runs and higher filtration rates because head loss does not build up as quickly as with rapid-sand filters. Multi-media filters are becoming popular, because they can greatly increase a water treatment plant’s capacity without loss in water quality

International Garnet

International Garnet is a high-density Garnet, mined in New York State. In our production facilities in Keeseville, NY, and Laval, Quebec, we process a clean and custom-screened Garnet for water filtration. more...


Emerald Creek Garnet is mined in the Carpenter Creek and Emerald Creek basins in Idaho, USA. Mining started in 1930; the processing plant is in Fernwood, Idaho.

Deposits are an almandine Garnet with excellent properties for use in multimedia water filtration applications. Garnet is recommended as a support. more...

Crushed Glass

Crushed glass is made of 100% crushed, recycled glass that has been washed, disinfected, dried, screened and bagged.

The main use is in pool filtration systems.
Crushed glass is lighter (less dense) than sand. In many cases, crushed glass has been known to remain effective up to 10 years, compared to 2 - 3 years with sand. more...