Atlantic OASE OASE Add. Pack Hel-X 13mm - 20L
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Biological filtration by colonies of beneficial bacteria remove toxic ammonia, ammonium and nitrites. Hel-X Bio-media has a huge ratio of protected inner surface versus exposed outer surface so the agitation caused by the turbulent water does not damage the bacterial colonies inside the media. This keeps colonies clean and active without a loss of decomposition capacity. Hel-X 13 provides the perfect substrate for bacteria in ProfiClear Premium Compact Filters and Modules. Hel-X 13 Add Pack contains 20 liters of bio-media.