Initial performance was poor. Eventually it turned out that the problem was in the foil on the lid blocking all the vent holes! Invisible until I had a reason to clean the lid. After the foil was removed, the pump was able to produce the expected volume of bubbles and foam, and performance improved significantly. Now works well for a 100 gallon reef tank with a 20 gallon sump. Good bang for the buck compared to other options.
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