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Jet Setting
  Whether a spa is concrete or portable, custom or mass produced, sound hydraulics and good plumbing are needed if the spa's jets are to give clients the hydrotherapeutic action they crave.  The manufacturers of portable spas do this work for their dealers, observes hydraulics expert Steve Gutai, putting watershapers who work in concrete at a disadvantage that must be addressed if a concrete spas are to compare favorably with a client's portable options.