Here's a small DIY one made very easily in about 10 minutes. Only uses agitation and aeration provided by two small air stones. You can direct the foam into a bucket or something.
http://www.koiphen.com/forums/showthread.php?55187-DIY-Protein-SkimmerThe big commercial farms use ozone to increase the effectiveness of a foam fractionator (Protein Skimmer).
Last edited by Cecil Baird1; 12/31/11 08:43 PM.