i only ran that drink bottle like that for a few hours and in that time it gave the water surface a head like a pint of beer. 1/4 inch of bubbly frothy goodness.. needless to say.. it is disconnected now and re-thinking it.. it really needs the input to be at the bottom of the chamber with the output near water surface. need to make a bit of custom plumbing. i am considering making a skimmer from it. i have experience in making large skimmers for large holding tanks, possibly do not need it for a freshy tank, but why not eh..
It's either that or i give the powerhead the ol spanish archer, elbow, heave ho
and then put in a small pump to feed water into the filter.