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Each liter of Matrix™ provides as much surface (>~700 m2) as 170 liters of plastic balls! Plastic bio-materials provide only external surface area, whereas Matrix™ provides both external and internal macroporous surface area.
Used to filter both fresh and saltwater ULNS systems the latter in conjunction with LR and a skimmer.
Only downside is running high calcium levels remember to stir it around a bit from time to time as it will set solid as a rock .