Are air stones needed in an undergravel filter? Can you start an undergravel filter without an air stone or pump?
Air stones (or venturi-type air diffusers on powerheads) are required for an undergravel filter to function properly. You can run the UGF without air stones, as long as you use the powerheads I mentioned before, with the aerators to oxygenate the aquarium. It will not work without some kind of pump to move the water through the uplift tube(s). Top • What is an airstone? An airstone is a piece of aquarium equipment that is used to diffuse air from an air pump into fine air bubbles. They are usually made of compressed ceramic or glass beads, or similar materials. They come in a large assortment of sizes, shapes, and styles, but all need to be connected to an air pump in order to do anything. Small sizes are often employed to power undergravel filters, while larger ones are purely decorative.
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