Hello Roger, I had ...

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Hello Roger, I had experiences with water fleas in activated sludge systems during hot weather.  The solution was to lower the MCRT (mean cell residence time) gradually until it was shorter than the life cycle of the water fleas.   The fleas can survive anoxic conditions for a long time.  The fleas did not survive a 24 hour anaerobic process.  You could also kill fleas with shock chlorination of the supernatant.    Interesting problem.  Let us know how it works out.  Best wishes,  Tom