My pool does not have a drain in the deep end and I seem to always be battling having cold water sink in the deep end of the pool and get stuck there. (It does not help that my fill water is cold well water and my fill valve is in the deep end under the diving board) So in an effort to get better water circulation I bought a venturi eyeball return replacements made by http://www.infusionpool.com/ a couple of months ago (I bought mine off amazon as I could get free shipping), and I can confirm that it does seem to really work. Now these do appear to be more delicate than traditional eyeball fittings which may be an issue as kids seem to always like playing with return fittings, but if you need to improve your circulation these might just do the trick.
Ike
Ike