You can improve the overall quality of your fluid effect, such as making the draw smoother and with less banding, by turning
on Float Point Render Target in the Viewport 2.0 options. To do this:
In the panel menu, select Render > Viewport 2.0 > .
The Hardware Renderer 2.0 Settings window appears.
In the Hardware Renderer 2.0 Settings window, select Common Options > Floating Point Render Target > Enable.