M.Paris,
If a single disc from Vertex has 6600 .5mm cuts, how is your 20' section equal to one disc? Who has tested this product? Do you have any test done yourself? What is the turnover rate at depth? How much cfm per foot is required and what size are the holes where the bubble is released?
There are also cases where you want to keep the thermocline when cold water species of fish are desirable and we do not want to increase the temperature from top to bottom.
