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another problem with venturi or eductors....something more for the koi to hit.
to me either are a patch....trying to get more DO or water movement. Those are the kinds of things that need to be planned in from the beginning.
If you want to build a BD with air dome...no problem. See attachment. You can also purchase them.
But none will do you any good if you already have the pond installed. BDs with air domes are something for the next pond rebuild. In the meantime, use air stone and a good air pump (at least 40L) to bring up the DO level. You want DO to measure at least 80% of saturation. DO can be measured with a drop kit, just like ammonia, nitrite, ph ...etc.
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Too much sanity may be madness and maddest of all is to see life as it is and not as it should be.
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