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It is another of the plants that seem to do best in an acid soil and rainwater treatment, but with plenty of root run.
You could try Biotal Refresh Rainwater Treatment – from garden centres.
Hubert, Canada, includes an 8 m wide catenary mechanical rake with throughput of 8 m3/s for rainwater treatment, as well as systems for grit removal, aeration, coagulation-filtration, and disinfection.