HS aqua Zeolite is an adsorbent natural filter material. It removes dissolved substances such as ammonia, nitrite, nitrates and phosphates. Algae growth is clearly reduced by the application of HS aqua Zeolite. 1 liter is sufficient for 200 l of water and has an operating time of approx. 3 months. After the material has lost its effect as an adsorbent material, it continues to work as a biological filter material. HS Zeolite is excellent for use in both freshwater and seawater aquariums.