JBL ProCristal i30 GreenStop 2xFor JBL ProCristal i30 internal filter: ready-to-use cartridge. Against green water and other algae in aquariums.Easy installation: open top
cover, insert cartridge into container, replace
cover.Fights algae: cartridge containing special filter media extracts algae nutrients from water.Replace filter material monthlyContains 25 ml of special filter media per cartridge