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Filox-R (Iron. Manganese and Hydrogen Sulphide Removal) Systems



Filox can be used for iron, manganese and hydrogen sulphide removal by catalytic oxidation. It is a robust media allowing a faster service flow rate than other iron removal media. A pH of 7 is recommended for iron removal and 8 for manganese removal. It is a heavy media requiring a strong backwash. Adding other media is possible but can impair it’s service flow rate.

Iron Removal Criteria
pH: 7-9
Iron content: <15 ppm
*Oxygen:15% of iron and manganese content

Manganese Removal Criteria
pH: 8-9
Manganese content: <3 ppm
*Oxygen:15% of iron and manganese content

Hydrogen Sulphide Removal Criteria
pH: 6.8 - 9
Hydrogen Sulphide content: <7 ppm

*On Filox Systems fitted with Clack WS1 CI valves you can add an air draw kit to increase oxygen in the water making the filox more effective.

Filox is an excellant choice when tackling Iron, Iron and managanese or all three. If dealing only with manganese or only hydrogen sulphide there are better options (see seperate section).

Filox may not be the best option if you are struggling to get your pH up to the required level or you don't wish to use a seperate pH system. Filox is quite heavy so requires a high backwashing rate - if you are unable to produce the nessecary backwashing rate again you may have to look at different options or concider using two smaller systems in parallel to achieve the correct back washing rate.
How Does it Work?

How Does it Work?

Water flows into the valve at the top, down through the media and then up through the ‘riser’ tube in the middle of the vessel. As the water travels through the media the iron and manganese are oxidised bringing the metals out of solution and trapping them so only clean clear water flows out to service. These systems also act as sediment filters trapping any natural turbidity. As the media act as a catalyst they do not need to be topped up or replaced on a regular basis.

There are timer options that can be set to automatically self clean (backwash) and wash away any of the accumulated iron and manganese.

The Aquamandix, Filox and Birm filters require dissolved oxygen in the water to oxidise the metals. This normally is present naturally but can be added by aerator or as an air filtration option. Greensand and MTM contain a lower concentration of active catalyst so require frequent regenerations with oxidation chemicals like potassium permanganate.

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