European Commission project  for your
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AFM
Active Filter Media
replaces sand in all types of sand filter
Environmental & sustainable water treatment to save the planet

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Public aquarium and Aquatic enclosure reports
Trichloramine and water quality in aquatic enclosures

In a chlorinated system, the chlorine will react with ammonium to form monochloramine, which is okay.  However under acidic conditions below pH 5,  toxic trichloramines will be produced which will damage the eyes and lungs of the animals.  Even if it is a marine system at pH 8.3 or a freshwater system at pH 7.5,  trichloramines will still be produced.

Bacterial will be growing on every surface in contact with the water ( chlorine does not kill biofilm), and the greatest surface area is the sand in the sand filters.  The pH of biofilm will be below pH 5 and  as such it is the primary location of trichloramine production.  However if you change the sand for AFM, you effectively eliminate the biofilm and trichloramines.  The difference to water quality is huge.

In addition to AFM it is recommended that you use flocculation prior to filtration with NoPhos. The combination of AFM and NoPhos will reduce your chemical consumption by at least 80%.

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