Actually there are a few protein skimmers designed for freshwater applications only. We have seen units available for ponds and there has been several articles in Ponds USA dealing with DIY units for ponds. We have a large Sanders freshwater protein skimmer operating on our koi quarantine system which happens to also displayed in The Reef Aquarium Volume 3. The key is maximum aeration through specialized ceramic air stones being fed by approximately 20 l/min of air. This particular skimmer stands 7 feet and removes high levels of organic waste. The foam is less frothy but rich in organics. We saw various models at the Interzoo in Germany last year but again, most are marketed towards large applications. Expect to see smaller versions in the years to come particularly with the increase in ozone use with smaller freshwater aquariums in Europe.
Big Al's BC
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