Oase FiltoSmart 300 Foam Set size-15-watt or 850 includes an ultra-coarse

or 850 includes an ultra-coarse replacement filter foam

Eight different types of flakes contain i

thiamine mononitrate (vitamin B1)

Activated carbon

and will readily crawl into the tubes which provide hiding places for them

Oase FiltoSmart 300 Foam Set size-15-watt or 850 includes an ultra-coarseThe Oase FiltoSmart 300 Replacement Filter Foam Set provides effective mechanical and biological filtration within your Oase FiltoSmart External Filter to keep your aquarium and its inhabitants happy and healthy. Mechanical filtration is the removal of debris and waste from the aquarium to provide clear water. Biological filtration occurs through the colonisation of your filter foams by beneficial bacteria which break down toxic ammonia and nitrite,