ISTA Round Bio-Sponge Filter Black 5in LG
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Mechanical filtration: Provides excellent filtering effect while oxygenating the water Biological Filtration: Foam material supports the colonization of bacteria Can be used with either an air pump or any external filter Silent operation by reducing air pump noise Easy to install and simple to maintainView AllClose
ISTA Mechanical and biological filtration: Used w/ air pump or external filterView AllClose