sera guide - Marine aquariums

3.4.5 Special sera filter media 29 The standard equipment of the sera internal filters is entirely sufficient for permanently clean and crystal clear water. However, using additional filter media may become neces- sary due to external influences. Further filter media can be used within the internal filter of the sera marin Biotop Cube 130 without any problems. You can addition- ally simplify addition and removal with a sera filter media bag. Removal of toxic substances sera super carbon (filter carbon) is particu- larly pure and provides a large surface. It ab- sorbs toxic substances from the aquarium within shortest time. Due to its very large sur- face, sera super carbon remains active for 6 weeks. Then its uptake capacity is spent, and the filter carbon must in any case be re- moved from the filter. Otherwise, substances already taken up can get back into the water again. sera super carbon does not affect the pH value and is free from phosphates and nitrates. Removal of diatoms Silicate supports the formation of diatoms in marine aquariums. In some areas, silicate is added to tap water by the water provider as to inhibit corrosion. By doing so, water pro- viders protect the pipes, but indirectly harm every marine aquarium. sera marin silicate clear binds silicate permanently and, by do- ing so, withdraws the quickly growing di- atoms their skeleton construction material. The sera SiO3-Test allows to easily monitor the levels in tap water or in the marine aquar- ium.