SIP GLAX 540gr is an essential material for aquarium filtration. Its porous and adsorbent sintered glass composition allows for superior bacteria settlement compared to traditional ceramic rings. It effectively decomposes harmful substances like ammonia and nitrites, ensuring a healthy and safe environment for your fish. Suitable for overcrowded or marine aquariums, SIP GLAX is easy to use and should be rinsed before application. Use 540 grams for every 300 liters of aquarium capacity, and replace 50% of the mass annually.