JBL Procristal i30 GreenStop - Special filter material against green water 

• Ready-to-use cartridge for the JBL ProCristal i30 internal filter.
• Green water is caused by floating algae. The cartridge withdraws the nutrients from the algae so they disappear.
• Suitable for JBL ProCristal i30 internal filter.
• Needs to be replaced on a monthly basis.
• One cartridge contains 25 ml algae combating filter material.