If your hot tub is not already plumbed for an ozonator, installing an ozone jet is one option to get ozone into your water. You simply tee off any pressure side water line, and connect to the water port of an ozone jet. Then connect your ozone tubing to the air port of the ozone jet.
Ozonator Jet or Cluster Jet with 1/2" Slip or 1" Spig connection for water.
Ozonator Jet or Cluster Jet with 3/4" Slip connection for water.
Front Wall Fitting (Jet Internal) for Waterway Ozone / Cluster Jets. 1.5" Face Diameter.