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If your vortex is sufficiently big, I would divide the flow after the water has passed through it. So after the vortex, part of the water to the BS, part of it to your regular filter setup. From the BS, I would return the water gravity to your pond, maybe via the waterfall. The water from your regular filter I would return via a pump directly to the pond for circulation.
What is the diameter of your vortex?
Regenmeneer
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