Medium bubbles: The air stone produces dense and abundant bubbles to aerate your water tanks. A great way to increase oxygen solubility in aquariums, fish tanks or ponds. Model: ASR-100; Spray volume: 15L/min; Recommended air pump power: 4W; Standard ID Air Hose: 0.6cm or 0.9cm. Ideal for aquariums, DWC systems or ponds. Reliable Material: Made of mineral material and sintered at high temperature, it has no effect on the health of your aquatics. Helps maintain healthy fish or root growth. More Float: Measures 10D x 3.8H (cm) and weighs 328g. And its wide, flat bottom always keeps it stable in the tank to produce more stable bubbles. Easy to use: completely soak the stone in water for more than 3 hours before use. Clean it regularly with a brush because it clogs after weeks or months of use.