Randy Holmes-Farley
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On the alkalinity front, Ken Feldman found that one of the main ingredients in skimmate is calcium carbonate, which may (or may not) be evidence of calcifying plantkon being skimmed out:
Elemental Analysis of Skimmate: What Does a Protein Skimmer Actually Remove from Aquarium Water?
Department of Chemistry, The Pennsylvania State University, University Park, PA 16802. The chemical/elemental composition of skimmate generated by an H&S 200-1260 skimmer on a 175-gallon reef tank over the course of several days or a week had some surprises.
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