Ion Exchange Indion ISR

Ion Exchange Indion ISR

We acknowledge that the Indion ISR product has successfully met the process requirements. We have received positive feedback from the customer, which further reinforces our commitment to pursuing similar application opportunities in this region. 

Additionally, your team’s timely support during the initial process-quality challenges was highly valuable. This assistance enabled us to thoroughly evaluate our offering and optimise the process in alignment with your product specifications. We sincerely appreciate the collaboration, technical guidance, and support extended by your team throughout this engagement. 

The background of the application is provided below: 

Plant & Water Source: Type of water source being treated. The customer is running a resort. Here below the flow diagram for your understanding. Bore water wanted to use for drinking, bathing/showering, kitchen and laundry Iron and manganese removal based on water analysis provided manganese less than 1 ppm and iron less than 2 ppm . Hard water c.a 130 ppm

Suitcase style desalination units.

Within a few days of the iron removal media filtration system installation, we received complaints regarding water discoloration. The customer claimed that the purpose of the media filtration system had not been achieved, as the water quality had not improved as expected.

Pictures pasted below:  

To investigate the persistent discoloration observed even after filtration through the Indion ISR media, a water sample was sent to a laboratory for Total Organic Carbon (TOC) analysis. The test results showed TOC levels of less than 1 mg/L, indicating a relatively low concentration of organic carbon.
Despite the low TOC level, the remaining organic compounds were identified as the likely cause of the discoloration.

From an operational perspective, the low organic load is beneficial because it reduces the risk of rapid filter fouling and makes system maintenance more manageable. However, the removal of tannins using activated carbon filtration can be inconsistent. Tannins consist of complex organic molecules with varying chemical characteristics, depending on the type and degree of decomposition of the original organic matter. As a result, carbon filters may remove some tannins effectively while allowing others to pass through, making tannin removal somewhat unpredictable. 

The tannins can be partially oxidised by sodium hypochlorite, so we reintroduced chlorine dosing, particularly as a dosing pump was already installed on site.
We recommended that the chlorine dosage rate be lower than previously used, as the catalytic media filter requires air rather than chlorine for regeneration.

Inlet/Outlet Parameters: Initial iron content vs. reduced iron content after treatment with INDION ISR.
Filter Size: 24”

Inlet parameters

• Water Source: Bore
• pH: 6.75
• Hardness: >50 ppm
• Iron: >1.2 ppm 

Raw Water Aerated 

•  pH: 7.8 
•  Iron: 1mg/L 
•  Hardness: 50 mg/L

Filtered Water 

• pH: 7.75
• Iron: undetectable
• Hardness: <20 

Filter used in this application 

Water Sample

The image compares water samples collected before and after treatment using the Indion ISR iron removal filter.
The untreated sample (right) exhibits a dark purple coloration, indicating the presence of iron.
The treated sample (left) remains colorless, indicating the absence of detectable iron after filtration.
These results confirm the effectiveness of the Indion ISR media in removing iron from the water.