The OxyTex Air Diffuser is a pond aerator and filter mediumall in one. In combination with the AquaOxy 450 air pump, it injects air for optimized gas exchange and works to ensure that your koi and fish stock remain healthy and thriving. A unique combination of oxygen supply, water circulation and nutrient decomposition, OxyTex is a perfect supplement for any OASE filter. Its made of a patented grass-like fiber structure and provides a habitat for beneficial bacteria that improves filtration efficiency and contributes to a healthier pond environment. It requires a minimum of 18 inches installation depth. With cleaner and better quality water, the OxyTex will provide a richer and more luxurious water feature and maintains a healthy eco-system for ponds up to 5,000 gallons. The OxyTec Air Diffuser provides a habitat for beneficial microorganisms that improve filter efficiencyup to 25 percent. The OxyTex provides a natural aesthetic to your pond floor while improving the health of your fish.