Like the title says, the random, contant bubbles by the air pulled in by the vortex has been a problem- especially when the it's clean and pulling max water. The thinker I am, I cut up this samll lastic cup I got from work- it's used for collecting sterile urine samples, and yes, I did use a new, clean one. I covered the top portion of the intake that causes the vortex from the surface- viola- no more bubbles! By only cover about a 1/4, I think the over area flow more and makes up for the same output- seems to be. Still much better, no more random bubbles!