Oase Replacement Filter Foam for Biotec 5.1/10.1, Green

For BioTec 5.1/10.1 and BioSmart 18000/30000/36000. In the heart of the filter: Especially in the green filter sponges, the smallest bacteria do their best work, because substances that stimulate algae are converted into naturally occurring gases on a biological basis (denitrification). At a low flow rate, the sponges also filter out the smallest particles and thus clean the pond water. Together with the red and blue filter sponges, they demonstrate clean filter performance.