JBL Algae Prevent ProCristal i30 - Filter cartridge to prevent algae growth 

• Ready-to-use filter cartridge for the JBL ProCristal i30 internal filter. Easy installation: remove the water outlet, insert cartridge into container and put on the water outlet again.
• Withdraws the algae nutrient phosphate from the water, thus preventing algae problems.
• Needs to be replaced on a monthly basis.
• One cartridge contains 25 ml of phosphate remover.