You are here : Home | Water Filters | Library | Water Filters General Information

[one_fourth padding=”0 6px 0 0″]

Water Filters Info Header

Birm FAQ’s

Nitrate Removal FAQ’s

Activated Carbon FAQ’s

Carbon Filter FAQ’s

Sand / Anthracite FAQ’s

[/one_fourth] [three_fourth_last padding=”0 0px 0 0″]

Birm FAQ’s

How long will my Birm filter last?

A birm filter will usually last up to ten years with a yearly service,However within the ten years we would expect to have to change the media inside the vessel.The frequency of changing the media is totally dependant upon the incoming levels of iron and manganese.

How long is the guarantee on my Birm filter?

If you purchase your birm water filter from us all working parts are fully guaranteed for one year.

Do I need my Birm filter serviced?

It is usual to have a service contract with the company you brought the birm filter off.This company should inspect the water quality every year to ensure that the filter is working correctly.Please contact our service department for further details.

What incoming water parameters are required for the birm filter to work?

No hydrogen sulphide present.

Organic matter not to exceed 4-5 ppm as indicated by the oxygen consumed value.

Oil must not be present.

A dissolved oxygen content of at least 15% of the iron. (Example Iron = 10ppm.

Dissolved Oxygen = 1.5 ppm or more).

A pH of 6.5 or higher.


The correction of waters having a pH of less than 6.5 can be accomplished by several methods. Aeration, the use of Corosex “F” (CLACK neutralising method), or the addition of chemicals, such as soda are examples of common methods frequently used. A combination of the above methods is often used, depending on the amount of correction desired. The dissolved oxygen content of a water supply is raised by proper separation.
When rain falls the water has a naturally aggressive slightly acidic nature.This water then dissolves chalk and or metallic deposits present in the local rock strata which leads to contamination of the water.

This in turn results in ground and borehole water containing a number of elements that would not normally be present in mains water supplies. These contaminants such as iron and manganese can then cause problems when the water is put in to a system.

Acidic water results in corrosion of pipework, heating cylinders and other auxillary equipment.

Any iron or manganese present will result in poor tasting water and will also stain items such as baths or sinks.

Any ph valued water of less than 7 is considered to be acidic, and corrosion will accelerate between 6.5 with levels below 6 considered very aggressive.
It is usually difficult to remove iron and manganese from acidic water so it is usual to raise the ph in any system before treatment.

The simplest and most economic way to raise the ph in a water system is to install a ph correction filter where the water flows through a pressure vessel full of a ph correcting media such as magnodol.

The magnadol has a fixed dissolving rate and will neutralise water as it is passed through.

Ph correction filters will need periodically refilling with the neutralising agent and systems are sized with this in mind, It is expected that a ph correction system would need refilling around once per year.
To treat waters that are basically pure and otherwise clean a basic upflow system may be all that is required.
For water with iron and manganese fouling or turbidity an automatic backwashing unit would be required to remove accumulated debris within the system.

Water with a ph below 5 is uncommon and would not be treatable with this system.