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But how do we make the bubbles?











           • By dissolving air under pressure in a big




                  cylinder and expanding the pressure over



                  specially-designed nozzles





           = a SATURATOR & NOZZLE-based





                                                                                  or,






           • By sucking atmospheric air into a micro-



                  bubble generating pump and expanding




                  the pressure over a valve





           = a MICRO-BUBBLE PUMP-based
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