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The air filled lines have to be pretty large so the bubbles stay as fine as possible until they're injected into the main column.
I inject both at the same level in the same direction but turned slightly up and to the side so they climb up the sides like a double helix.
After multiple circulations, the helix isn't visible but it's still there to create an even longer cross-flow path.
So - huge air volume, dual injected, multiple passes and 10' chamber. Overkill so I turn it off at night.
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