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The diatom filter when properly charged with diatom earth is effective in filtering out most waterborne ich organisms. So it is effective in reducing the spread of ich, as it simulates the dilution effect of the ocean.
The diatom earth will have to be changed about weekly and the unit uses a lot of energy. It is good for brief uses only.
There is no practical alternative to eradication of ich by QT all fish and external/unknown sources of water. Eradication of ich is also quite doable and not difficult.
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