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South Africa
CALL 083 379 6996
+27 (0)11 395 3133

Nimbus Water office hours are Monday - Friday
08:00 - 17:00 local South Africa time (GMT+2).

 Water Filtration Solutions & Design Criteria

Typical Nimbus Water Technologies, South Africa, Water Purification Systems and water filtration & treatment technology for specialised applications in Domestic, Commercial and Industrial source water filtration and water treatment. Including borehole water, river or dam water.
Talk to Nimbus Water South Africa, regarding selecting the correct water treatment technology for your specific water treatment, or water purification application, be it influent, or effluent, grey water, wastewater, municipal water, river and dam water, or borehole water.
Water purification technology is on offer from Nimbus Water in South Africa, from basic filtration, treatment of hard water lime scale and dissolved iron, to advanced non chemical purification processes, including Ozone, Ultra Violet and Reverse Osmosis Membrane Technology.

Iron and Manganese in water - Filtration Solution

BIRM or GREEN SAND filter media & technology will remove iron and manganese that can cause staining of clothes and plumbing/household fixtures. Heavy metal, or dissolved iron in raw source water, mainly from borehole water, can only be removed via an ion exchange process. To correctly size the iron filtration system, Nimbus Water will need to know the iron ppm content, to ensure effective contact time required by correct loading of BIRM media.

Iron Removal Technology & Treatment Solution.

Iron filters remove iron and manganese that can cause staining of clothes and household plumbing fixtures. Ferric iron usually appears as rust coloured particales floating or settling in the water.

Ferrous iron is in the dissolved form and cannot be seen in water. When water containing ferrous iron is exposed to air, the iron oxidizes and ferric iron is formed.

Water with average iron or manganese content is not considered a health problem, but can be very objectionable in taste, odour, or appearance if iron is present in amounts greater than 0.3 milligrams per liter, or manganese is present in amounts greater than 0.05 milligrams per liter.

Iron filters are only effective for removal of ferrous or soluble iron and manganese. The system looks like water softeners but contain a bed of natural or synthetic manganese green sand.

Manganese dioxide oxidizes iron and manganese and the oxidized particles are then filtered out in the lower part of the media bed. Such filter can remove 75-90% of iron in concentrations as high as 10-15 milligrams per liter.

Iron Filter - Diagram

See Download for technical information and detail.Iron filter, backwash model. The unit is used for removal of iron, sulfur, sediment, tastes and odours, depending upon the filtering media/material used in the tank. Talk to Nimbus WaterTec for FREE advise.

Five types of iron removal systems and technology are available. Iron Filter, Water Softeners that contain a zeolite mineral in the resin that will remove soluble iron on a ion exchange basis - the same waycalcium and magnesium are removed in water softening.

Polyphosphate Feeder can handle up to 3 milligrams per liter of iron in solution. This process contain a phosphate compound which coates the soluble iron and prevents its oxidation when the water is exposed to air.

Chlorinator and filter, or chlorination followed by filtration through a sand filter can remove any quantity of iron in any form. The chlorine oxidizes and precipitates the iron and the filter strains out the particles. Carbon filtration may be required to remove exess chlorine residue.

Aerator and Filter as an alternative system/process to chlorination for iron removal is that of aeration followed by filtration. An aerator introduces oxygen into the water, thereby causing ferrous iron to precipitate through oxidation.

Typical Iron Removal & Filtration System Installation.

Removal of dissolved metals in borehole or well water, Iron as Fe and Manganese as Mn, only effective through an ION EXCHANGE system, using special BIRM as the filtration media in the filtration process. Dissolved Iron causes RUST type staining, and Manganese BLACK staining.
Heavy metals in borehole, or well water, generally is an aesthetic, or operational issue, The water test results will indicate, if the heavy metals exceed the SANS241 limits for operational, or there is any risk of chronic health relating to the level of iron in the water
For Nimbus Water to offer a correctly sized iron removal system, Nimbus do recommend that the borehole water is tested against SANS241. Nimbus Water need to know the pH level and the level of dissolved iron, or heavy metals in the water in mg/l, or ppm.

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Acid water has high carbon dioxide content and a pH below 6.8

Causes green stains on sinks and silver, porcelain bathroom fixtures. Blue-green cast to the water.


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Nimbus Water offer water treatment solutions for in-fluent source water & effluent waste water, borehole water treatment, rain water harvesting, including municipal water back-up & Jo-Jo water storage systems & solutions. Nimbus Water offers a range of standard to specific designed point of use, or point of entry (whole home or building) inline water treatment systems.

Andre Pretorius

Director, Technical & Sales
Andre Pretorius

  •   15 Year Experience
  •   Designed for Application
  •   Proven Treatment Processes
  •   Latest Technology
  •   WHO Standards
  •   Turn Key Projects
  •   Cost Effective Systems

South Africa
CALL 083 379 6996
+27 (0)11 395 3133
Nimbus Water (Pty) Ltd
No 5 Newton Road
Hughes Industrial Park Area
Boksburg, 1709
South Africa
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