JBL Aqua Filter jbl procristal i30 greenstop (x2)

For internal filter JBL ProCristal i30: ready-to-use cartridge. Against green water and autres algae in aquariums. Easy installation: open top cover, insert cartridge into container, replace cover. Algae control: the cartridge contains a special filter mass that extracts algae nutrients from the water. Replace filter material tous monthly Contains 25 ml of special filter media per cartridge.