[Medium Bubbles] The air stone will produce a large number of dense bubbles to inflate the pool. A great way to increase the oxygen solubility in your aquarium, fish tank or pond. Model: ASR-100; Injection volume: 15 L/min; Recommended Air Pump Power: > 4 W; Standard inner diameter of aircraft pipes: 3/16" or 3/8". Perfect for aquariums, DWC systems or ponds. 【Reliable Materials】The machine bubbles are made of mineral materials and sintered at high temperature, which will have no impact on the health of water sports. Helps keep fish healthy or grow roots. NO MORE FLOATING: Size: 10cm deep x 3.8cm high, weight 310g. Wide and flat bottom always keeps the stone in the air stable in the tank, resulting in more uniform bubble formation. Easy to use: Completely immerse the stone in air and water for more than 3 hours before use. It will clog after weeks or months of use, clean it regularly with a brush.