Pssopp Sintered Air Stone for Aquarium and Fish Tank, Round Bubble Diffuser Plate for Hydroponics Pond Systems, 15cm Airstone Disk

【Note】Please soak the air stones in water for about 15 minutes before usage. Please note the deeper you put the air stone under water, you may need use a larger wattage air pump to drive it. 【Increase Oxygen】The air volume is large and the air output is even, an ideal way to add oxygen and lower CO2 levels to your hydroponic, circulation system, pond, fish tank and aquarium. 【Durable Material】Aquarium air stone disc is made of sturdy and sand stone and stainless steel material, can be repeatedly cleaned, long time using. 【Keeps Fish Healthy and Active】The air stone was burned under high temperature, good air permeability, it is Safe, Washable & Durable, Non-toxic material keeps fish healthy and active. 【Exquisite Stone Shape Design】Round and flat bottom make the stone place steady, frosted surface, delicate and smooth.