[Hazel]

I think I understand what you're saying. For tension induced tissue growth to occur, it is better to have the tension (the outward pull on the breasts that drives the growth) to last longer. Since you can't pump all day, this is not possible. Swelling keeps this tension going long after you've completed your NB session, which helps in the tissue growth by maintaining that tension. Since water helps swelling, it is good for growth. Swelling is temporary, it is flow of blood to the breasts improved with good hydration. This is not what we're looking for. Swelling helps growth, which is the important part.