I am not sure anybody has any real numbers on just how much they help. Most people seem to implement them in conjunction with other measures while trying to battle a problem. It may be that the RDSB in a bucket is just one tool that helps in the battle and in a given situation is simply not enough to fix the problem, as is the case with a fuge or any other tool.
Mine is not online yet. I am just finishing a large skimmer and don't want to put another pump (albiet small) online for a few months. I have a significant other that tracks the electric bill my the milliwatt hour!
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