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Thanks JasPR.
By the way, the picture you attached earlier, is that a MICRO bubble diffuser? I was under the impression that micro bubbles are so small that they are practically invisible to the naked eye. The bubbles in your photo look like normal sized bubbles that might come out of a typical air stone.
So much for the theory behind micro bubble diffusers, but has anyone actually USED them in a koi pond and can vouch for their benefits?
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