JBL SuperClear for ProCristal i30 High performance activated carbon for crystal-clear water. - Suitable for JBL ProCristal i30 internal filter: ready-to-use cartridge for crystal-clear water in the aquarium - Easy to install: open the upper cap, insert the cartridge into the container, reattach the cap - High performance activated carbon: special filter material binds and absorbs food remains and metabolic substances. - Replace the filter material every month - Package contents: special filter material for crystal-clear water, SuperClear ProCristal Product information Crystal-clear and healthy water Poor light conditions, over-fertilisation or even a surplus of nutrients can have negative effects on the aquarium water and may promote algae growth. Floating algae lead to green, bacteria to white clouding. - Crystal-clear water – The cartridge, filled with high-capacity actived carbon, binds and absorbs food remains and metabolic products and thus ensures crystal-clear and clean water. Easy installation: Open the upper cap of the ProCristal i 30, insert the cartridge into the container and reattach the cap.