Here is a quick summary of data I collected on the phosphate content in skimmate produced in my DIY skimmer. I plotted the % of the system’s phosphate removed per hour against the volume of skimmate as a percent of the total volume of the system produced per hour. To clarify, a bit less than 2% of the system’s phosphate is removed per hour when the amount of collapsed foam produced per hour is 0.1% of the system’s total. My system is about 187 liters and PO4 level during the study was around 0.01 ppm. For aquarists doing daily 1% water changes by wet skimming are potentially removing a significant amount of phosphate.
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