Medium Bubbles: The air stone produces dense, abundant bubbles to aerate your water tanks. A great way to increase oxygen solubility in aquariums, fish tanks or ponds. Jet volume: 15 L/min; Recommended air pump power: > 4W; Standard ID Air Hose: 0.5cm or 0.9cm. Ideal for aquariums, DWC systems or ponds. Reliable Material: Made of mineral material and sintered at high temperature, it does not cause any 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 as it gets clogged after weeks or months of use. Product 2 Packs of 10cm Bread Stone 10cm Air Stones features durability, stable bubbles and high dissolved oxygen. Optimal for aerating your water tanks and brightening up your aquatics. A must have in the home of aquatic lovers. Sintered at high temperature, it is well constructed to remain stable in water and produce constant bubbles for fish's breath. Perfect for fresh and salt water environments like aquariums, DWC tanks, fish tanks, etc. Abundant medium bubbles Pumps required: > 4W Suitable for 0.5cm or 0.9cm tubes Stable and durable Ideal for fish and plants Soak more than 3 hours What kind of air stone should I use? A bigger air stone needs a stronger pump to produce more of bubbles. Basically, larger air stones can produce nicer bubbles and they are used for powerful air pumps. If you connect a larger air stone to a small pump, bubbles will only be produced at the front of the stone. Small pumps go well with small air stones while powerful pumps and small stones do not mix. About shapes The most common shape of this apparatus is the cylinder. However, you can also find it as a globule, disc, or even a cuboid. Cylindrical shapes can come in many sizes and colors. Disc shapes can stay stable at the bottom of your tank, while globular shapes can produce more bubbles in the case of the same size. 10cm Bread Kettle Driven by pumps over 4W, the bread bubbler is solidly built for continuous use. Well weighted to flow easily for consistent bubbles. Regular medium bubbles With a large spray volume of 15 L/min, the bubbler produces many medium bubbles that burst regularly for increase oxygen level. Easy to use Soak the stone in water for more than 3 hours before use. Clean it regularly as it clogs and replace it when it does not work properly.