The WaveReef ROLFIL fleece filter is designed to help reduce the maintenance so that the waste has no time to breakdown in the water column. By using it, there is no need for swapping filter socks every few days. It is high efficiency water filtrationi system that effectively removes suspended particles by its great fleece such as: micro algae, detritus, food, organic waste and gravel dust from the water column. Each roll of fleece can last from 1 to 3 months. It is suitable for use inn mareine aquariums, freshwater aquariums, fish-breeding systems and propagation systems for corals.