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

or 850 includes an ultra-coarse replacement filter foam

Reliable: Safe battery operation

Accurate testing: Suitable for fresh and saltwater environments

thiamine mononitrate (vitamin B1)

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,