Hi bro,
Thanks for your purchase on Hydra Filter. Regards to this problem about air bubbles, thanks for your feedback. We had investigate and found that this is due to the internal L joint that "suck" in the surface air to create bubbles in the water. We are looking into how we can further improve on the design to have a better air flow.
The L joint caused a reduction in air flow and therefore when it is placed even at 5cm depth as instruct in the manual, the air flow might not be too signicant unless it is place less than 5cm depth which is near to water surface.
The function of air venturi is to create water disturbance to allow more oxygen exchange between the water surface and the environment in addition to the water circulation that is created by the filter.
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