Call us for a solution to your water contamination.

The Filter Guy Ltd will be able to consult on your current water problem and find a solution to correct it.

Call David

  • 0800 159 858
  • 0212044682.
  • All of New Zealand, International.

Or visit 

Commercial and Industrial filtration solutions.

Some filtration systems we have provided to remove certain contaminants in water.


  • Boron removal
  • High Iron removal >10ppm
  • Silca 
  • Endotoxin 



Boron removal is essential as high boron concentrations can be toxic to humans, plants, and aquatic life. Boron is a metalloid that is found in nature, with the majority of the Earth’s boron located in the ocean. Freshwater typically contains a small concentration of boron but can be significantly increased as a result of wastewater discharges or nearby industrial activity.

Elevated boron levels can also be present in groundwater as a result of leaching from rocks and soils containing boron compounds. Boron concentration limits below 2 mg/L are commonly set by regulatory bodies when discharging to natural waterways, and the World Health Organisation provides a guideline limit of 0.5 mg/L in drinking water.

High iron.

Ferrous (Clear-Water) Iron Treatment

BAN-IRON ™ systems are effective at removing clear-water iron.  Water softeners are the more common method for levels <3. Manufacturers report that some water softeners can remove up to 10 mg/L. However, 2 to 5 mg/L is a more common limit. A BAN-IRON ™ filter can be effective for levels that are up to 10 to 15 mg/L.

A water softener removes hardness minerals like calcium and magnesium. Iron will plug the softener and must be periodically removed from the softener resin by backwashing. A water softener will be less effective if there is low water hardness and high iron or the system allows contact with air, such as in an air-charged “galvanized pressure tank.”

Chemical oxidation using chlorine or hydrogen peroxide and filtration is also used. However, proper dosing can be difficult and carries health risks if improperly dosed.

Ferric (Red-Water) Iron Treatment

  • Iron filters (such as a manganese greensand filter) are a common treatment for red-water iron levels up to 10-15 mg/L.
  • Aeration (injecting air) or chemical oxidation (usually adding chlorine in the form of calcium or sodium hypochlorite) followed by filtration are options if iron levels are more than 10 mg/L.
  • Sediment filter, carbon filter, or water softeners can remove small amounts of iron, but the iron will quickly plug the system.


If the silica is reactive silica, then Reverse Osmosis is the most practical method to remove it from the water supply. Reverse osmosis will reduce both colloidal and reactive silica, but proper pretreatment is necessary, including oxidation of iron, sulfur, and manganese, removal of chlorine, and chloramine, while hardness must be treated with a water softener or an Anti-Scalant. It is also recommended that the RO system incorporate a permeate flush, which means that the membranes are soaked with RO water, so that scale, including silica, will not foul the membrane surface. We have a proven track record to remove Silica from bore water ask us how we can help you.


For all laboratory water types 

Type 1, 2 and 3