Another option when/if the diffuser is moved to shallow water is to substitute the Vertex diffuser with one that moves a lot less water. A homemade would be adequate for keeping a small area open in winter with snow cover. I also like the option of bleeding off a major amount of the air to the shallow winter diffuser thus when the Vertex receives only a small volume (0.5-1cfm) of air and the fewer bubbles it makes rewults in less water moved.
Last edited by Bill Cody; 11/04/10 07:58 PM.
