Ecological Labs Microbe-Lift Gel Filter Cartridge Innoculant. MICROBE-LIFT/Gel Filter Cartridge Inoculant will quickly attach to and populate all brands of filter cartridges and all styles of media including foam, floss, bio-balls, ceramic media, etc. This will help rapidly establish the necessary biological activity in your filter to stabilize your aquarium's environment quickly. It will also help to restore the activity to your filter when you clean or change the media and when you replace your filter cartridge. A technological breakthrough because it is the first product that lets you put the bacteria right where you want it and it STAYS THERE. Available Size: 4 oz