Type A self-sinking aeration pipe hole distance 3 5 m Type of self-sinking aeration pipe hole distance 1 5 m C type self-sinking aeration pipe full hole D type self-sinking ventilation pipe not perforated E type self-immersed tube
Aquaculture in the water:
Self-sinking oxygenation tube
The bottom oxygen:
Self-sinking aeration pipe
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