A chemical-free technology ...

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A chemical-free technology for controling biofilm in water lines of any reasonable size is with HydroFlow, which emits a sustained 150 kHz frequency that neutralizes bacteria (sessile and free floating), algae and scale accumulation. HydroFlow operates on low energy consumption (AC current) and attaches to the outside of any pipe material. https://www.youtube.com/watch?v=uwe2RCDt76Y