For treatment of taste and odour problems, inactivation of pathogens, highly contaminated water sources; used in conjunction with BioSand and BioCarbon.

For water with extremely high levels of contaminants and taste or odour issues, ozone pre-treatment is recommended. Ozone will oxidize or "break up" contaminants. This process can best be described as cutting up a piece of steak before eating it. If the contaminants are "cut up" by ozone, the microorganisms more efficiently digest them. This allows greater contaminant loading by the system, more efficient digesting of contaminants and the ability for the system to deal with a wider range of contaminant problems.

For pre-treatment removal of iron, parasites, colour, cysts, manganese, arsenic, lead, mercury and turbidity.

The Roughing Pre-Filter is an option available as a part of Mainstream's multistage biological filtration process, used in highly contaminated surface water conditions, and certain ground water applications. It serves the following three functions:

1. Protecting the BioSand Filter from solids loading thus increasing its run length between back washing sequences.
2. Improving turbidity when the Roughing Pre-Filter is ahead of the Mainstream BioSand Filter.
3. Contributing to coliform removal.

The Mainstream Roughing Pre-Filter acts as a biological pre-filter, which will enhance the Mainstream treatment in the next treatment stages. The Roughing Pre-Filter can also remove larger suspended solids such as algae, provide additional removals of coliforms under challenging operating conditions, and contribute removal of Cryptosporidium.

For treatment of iron, parasites, colour, cysts, manganese, mercury and turbidity.

Biological water treatment uses living microorganisms found naturally in all water sources to purify the water. The Mainstream Biofiltration system gives these microorganisms a “home” where the untreated water flows through at a pre-determined rate. While the untreated water is making its way through the system, these microorganisms feed on the contaminants in the water.  As the microorganisms populate the BioSystem, they form a highly effective water treatment system.

In the BioSand system, most of the microorganisms are concentrated in the top several inches of the sand. The untreated water enters the system and by the time the water flows through the BioSand, most contaminants are digested by the microorganisms.

Most traditional household water filters have a micron rating of 10 to 50 microns. A Mainstream BioSystem is rated at less than 1 micron. How big is a micron? There are 25,400 microns in one inch. This dot (.) is approximately 1/64 of an inch wide and equals 396 microns.

For treatment of Dissolved Organic Carbon (dissolved organic material in water), tannins, pesticides, iron bacteria, color, odors, and is used in conjunction with BioSand for further treatment of iron, parasites, color, turbidity, cysts, manganese and mercury.

Mainstream BioFiltration systems rely on two separate environments, BioSand and BioCarbon, that work together as a complete system.  BioCarbon is used in conjunction with BioSand for further treatment of problem water.  BioCarbon absorbs contaminants from the water and microorganisms that populate the outside of the carbon feed on the trapped contaminants.  By providing two different treatment environments, the Mainstream BioSystem is the most efficient and effective biological water treatment system available.

For storage of non-chlorinated water for filter rinsing and recirculating through the BioCarbon Multimedia filters.

Water treated through the Biofiltration system is kept in constant motion in Mainstream’s unique aerated storage tank.  This prevents water from going “stale” and the storage tank also recirculates the water through the BioCarbon tank.  This prevents oxygen depletion of water and ensures efficient use of the BioCarbon environment.