Quickly and reliably absorbs toxic substances and colorants from the aquarium water. The yellowish tint of the aquarium water disappears. The water becomes crystal clear. sera super carbon does not affect the pH value. sera super carbon is free from phosphate and nitrate. You should for a short while increase the amount of sera super carbon in the filter after a disease treatment.Do not apply filter carbon, or remove the filter carbon used, before treating diseases with a treatment. Otherwise the active substances of the treatment are immediately absorbed.Due to its super large surface, sera super carbon remains active for 6 weeks. Suitable for filtration of fresh- and saltwater.