It keeps the neck clean, if you run the skimmer a little wet and cycle the swabbie a couple times a day the foam carries the debris up and out, depending on what skimmer you use it will require a trial period till you get it dialed in, I am getting better more consistent skimmate and spend less time breaking down the skimmer for cleaning, I don't mind maintenance but of all the smelly things my tank produces skimmer mung is not my most favorite.
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