Quote Originally Posted by JackdaWack
And when it reaches the top, there are manny bubbles that attribute to putting oxygen in the water at the surface, so having no bubbles at the surface compared to having them there. I dont see a disturbance in the surface fo the water having to much more of an effect ot the oxy levels.
Sorry jack but I do disagree with you; it's just that physics have proven that the movement of water will produce oxygen. You are not putting air into the water from the diaphragm the air comes from the bubble action.

What you see in your organics is the sediment from your nutrients and in my opinion people who grow organics need to have a second submergible pump in their res to keep the nutrients mixed up at all times or you will get the sediment like you are saying. The action of the pump moving the water around will also provide oxygen as well. Not as much as the cascading action will but it will oxygenate the water all the same.
Itâ??s just basic science, nothing new.