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Why properly maintained systems don't need magnets

Magnetic filters are often pitched as the answer to keeping closed heating and cooling systems free of harmful and energy draining contaminants. Yet, they are actually not required in systems which are properly maintained.

BSRIA BG50.2021 states:

"Magnetite has an average particle size of 8um, which is too small to be captured by conventional barrier filter technology."

It goes on to say….

"Not all debris is magnetic and filters incorporating an element of non-magnetic retention may be preferred".

Let's take a closer look at the types of fouling in closed systems and whether the contaminants are attracted to magnets:

  • Iron hematite (red iron oxide) - NO
  • Iron magnetite (black iron oxide) - YES
  • Copper oxides - NO
  • Aluminium oxides - NO
  • Scale - NO
  • Organic materials - NO
  • Microbiological debris - NO
  • Biofilm particles - NO

So, out of eight types of fouling, only one type - iron magnetite - is attracted to magnets.

On the contrary, correctly specified physical filters will remove ALL of these types of fouling.

Offering little advantage (and many disadvantages, including higher expense and health and safety considerations), why fit magnets?

Physical filters are clearly the most beneficial choice for closed systems where suspended solids are of concern.

At DosaFil, our devices combine side stream filtration with automatic air removal and chemical dosing.

DosaFil-Duo® devices are able to filter down to 0.5micron meaning they are able to effectively remove even the finest particles of suspended solids without the need for a magnet.

To find out more about our devices, please get in touch.


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