Here we explain what activated filter media is and why it is a great choice for your pool filtration system. The filter media is responsible for removing dirt and debris from your swimming pool. As it ages the media deteriorates and eventually reaches a point where it needs to be replaced. Replacing the media in your filter is considered routine maintenance and should be completed on a regular/scheduled basis.
We recommend and use Activated Filter Media. AFM® is the world’s best filter media and the manufacturers have the evidence to prove it. It is a fully bio-resistant filter media providing:
- Crystal clear water
- Healthy air with less chlorine smell
- Reduced operating costs
- Sustainable filtration for many years
Why Switch to Activated Filter Media (AFM®)? The Science-Backed Upgrade Your Pool Deserves
If you’re still using traditional sand or glass media in your pool filter, it might be time to level up. At Poolside Christchurch, we recommend AFM® – Activated Filter Media, a scientifically developed filtration media that outperforms sand and other glass alternatives in nearly every way.
Whether you’re after clearer water, healthier air, or simply want to reduce your chemical use, AFM® delivers on all fronts.
What Is AFM®?
AFM® is a highly engineered glass media made from pure green and brown glass that has been activated through a patented process. This activation changes the surface of the media, giving it unique adsorption properties and a much larger surface area than sand or regular glass media.
It doesn’t just filter. It actively protects.
The Problem With Sand Filters
Sand is a breeding ground for bacteria. Why? Because the tiny crevices on sand grains are the perfect place for bacteria to attach and form biofilm — a protective layer that allows bacteria to multiply and resist chlorine. Within days, your sand filter can be harbouring millions of bacteria that even backwashing and high chlorine levels can’t eliminate.
This biofilm leads to:
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Increased chlorine demand
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Higher chemical usage
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Unpleasant odours (like chlorine smell)
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Poor water clarity
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Health risks from waterborne pathogens
How AFM® Solves It
AFM® has a self-sterilising surface that prevents bacteria from attaching and forming biofilm. Its activation process creates:
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A mesoporous structure that dramatically increases surface area for particle capture
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An activated surface charge that enhances the adsorption of fine organic matter and particles
This means:
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No biofilm = no bacteria growth
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Lower chlorine usage = fewer by-products like trihalomethanes (THMs)
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Crystal clear water = no cloudy surprises
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Healthier air = less chlorine smell in and around the pool
Proven Performance – The Numbers
Independent testing by Europe’s leading filtration lab (IFTS) showed that AFM® ng can filter 95% of particles down to just 1 micron in size. That’s incredibly fine filtration. Standard AFM® filters 95% of particles down to 4 microns. In comparison, traditional quartz sand only filters down to 20 microns, and most glass media can only catch particles larger than 25 microns.
The smaller the particles your media can filter out, the cleaner and healthier your pool will be.
Long-Term Value
AFM® lasts twice as long (or more) compared to sand or glass media. While standard media needs changing every 5–7 years, AFM® can last 10 years or longer with no need for regular chemical cleaning.
With AFM®, you’ll also:
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Save 20–30% on chlorine and acid
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Use less water when backwashing
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Reduce wear on your pump and equipment
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Enjoy crystal-clear water all year round
Easy to Switch
AFM® is a direct replacement for sand or glass and can be installed in almost any filter without modification.
