ACTIVATE - Sand Filter Alternative
never change your sand in your current filter ever again!
What is AFM®?
AFM® Activated Filter Media is a direct replacement for sand, doubling the performance of sand filters without the need of additional investments in infrastructure. AFM® resists biofouling, biocoagulation and transient wormhole channeling of unfiltered water and never needs to be recharged or replaced.
AFM® is a highly engineered product manufactured from a specific glass type, processed to obtain the optimum particle size and shape. It is then exposed to a 3-step activation process to increase its surface area by up to 300 times for superior mechanical and electro-static filtration performance.
AFM® benefits at a glance
... more than doubles the performance of an existing filtration system
... is not subject to biodynamic instability and will never allow untreated water to pass
... substantially lowers chlorine oxidation demand
... lowers backwash water demand by an average of 50%
... is expected to last for the life of the filtration system
... provides quick return on investment
What makes AFM® so effective?
1. Clean, carefully selected glass
AFM® is only made from pure green and brown glass which have the necessary metal oxides to help
make AFM® self-sterilising.
2. Ideal hydraulic properties
The raw material is ground into the optimal grain size and shape that is crucial for the outstanding hydraulic characteristics of AFM®. No dangerous glass splinters are allowed to be present in the filter material. Our manufacturing process is ISO certified.
3. Activation process
The AFM® activation process creates a mesoporous structure with a huge catalytic surface area. Sand has a surface area of 3,000 m2 per m3 but AFM® has a surface area up to 300 times greater for adsorption and catalytic reactions. Hydroxyl groups on the surface give AFM® a strong negative charge, known as the zeta potential, that attracts heavy metals and organic molecules. In the presence of small amounts of oxygen or oxidising agents, the catalytic surface generates free radicals that make AFM® self-sterilising.
AFM® exceeds the performance of quartz and glass sand by far
Crystal clear water: AFM® filters much finer than quartz or glass sand. At 20 m/hr filtration speed a nominal filtration of 5 microns is achieved without flocculation – AFM® filters at least 30 % more organic substances than fresh quartz or glass sand. With optimised coagulation and flocculation with APF and ZPM, a nominal filtration of less than 0.1 microns can be achieved.
Lower chlorine consumption means less secondary chlorine reaction products: chlorine is an excellent disinfectant. But in reaction with organic and inorganic substances it also produces undesirable, harmful reaction by-products such as trichloramine and THM‘s. The more chlorine is consumed the more secondary reaction by-products are produced. With AFM® we can remove far more substances than with sand or glass sand. This applies particularly in connection with coagulation and flocculation. Everything that can be filtered out and removed in backwash process doesn’t have to be oxidised. The better the filtration the lower the chlorine consumption and less disinfection by-products are produced.
Bioresistant – no home for bacteria, viruses and other pathogens: sand is a good mechanical filter but it’s also an ideal breeding ground for bacteria. Within just a few days every grain of sand is colonised by bacteria. They immediately form mucus to protect themselves against the disinfectant. In this so-called «biofilm» live entire communities of bacteria and other pathogens – including Legionella. If you have no organic film in your filter there are also no Legionella.
No trichloramine and no chlorine smell: the bacteria in the biofilm convert urea into ammonia which then reacts with chlorine to inorganic chloramine (mono, di- and trichloramine). Trichloramine causes the unpleasant chlorine smell and is also a severe health hazard. If however, no heterotrophic bacteria are present, urea remains in the water. It reacts with chlorine to the harmless chlorine urea. No biofilm – no trichloramine – no chlorine smells.
Filter function remains good with AFM® for many years: No biofilm in the AFM® filter also means no channelformation to disrupt the filter function. Due to filter contamination the performance of a sand filter worsens dramatically after 6 – 12 months despite frequent backwashing. The performance of AFM® remains consistently high for many years.
What makes AFM® that effective?
Clean Green glass: The raw material used for AFM® has to have a very specific glass quality. AFM® is only made from pure green glass which is the only glass that has the necessary chemical and physical properties to make AFM® self-sterilising.
Ideal hydraulic properties: The raw material is broken into the optimal grain size and grain shape. The correct shape is crucial for the outstanding hydraulic characteristics of AFM®. Balls (glass beads or pearls) as well as plates are not suitable for clean water applications. For security reasons, no dangerous glass splinters are allowed to be present in the filter material. Our ISO certified manufacturing process ensures that this is not the case.
Activation process: The AFM® activation process creates a mesoporous structure with a huge catalytic surface area. Typically crushed glass or sand has a surface area of 3‘000 m2 per m3 but activated AFM® has a surface area of over 1‘000‘000 m2 per m3which is over 300 times greater surface area for adsorption and catalytic reactions. Hydroxyl groups on the surface give AFM® a strong negative charge known as the zeta potential that attracts heavy metals and organic molecules. In the presence of oxygen or oxidising agents the catalytic surface generates free radicals that oxidise pollutants and disinfects the surface of AFM®.