I tried on both stones that came with my order. In one case, a single stream of small bubbles exited the stone and all the rest of the air exited as large bubbles where the inlet port made contact with the stone. The other had about 6-8 thin jets of rock bubbles and again several large bubbles where the inlet enters the rock. I put both of them to work for a few days hoping things would get better once they had enough water. None did. The little rock I got for free with my aerator works much better.
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KEDSUM Battery Aquarium Air Pump: Ultra-Quiet Rechargeable Fish Aerator with Dual Outlets - Ideal for Fish Tanks, Outdoor Fishing, Fish Transportation, and Power Outages
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