engineer is right on bubble bath. it will foam up 6" or more and run over the side. then you have to lower the water and may have to lower it below the jets.
There is a knob for air intake adjustment. More air will make the water feel like it will have more force up to a point. More air will also make more suds. Even shampoo will really suds up on you.
I like the calgon bath oil beads in a green box. Use about half what they recommend. Doesn't take much to give the water a nice oily feel.