Data Connect Enterprise offers Line Conditioners,
 by APC, Tripp Lite and other manufacturers

Line conditioners work by filtering and smoothing the power stream to eliminate dips, fluctuations and interference that can cause power to be "noisy". Their ability to reduce noise is measured in decibels over a given frequency range (just like noise reduction in your home stereo system). The more noise reduction, the better. Good line conditioners require high quality of components  to do the best job.  In some ways, a surge suppressor can be consider the "poor man's line conditioner".

While line conditioners provide very good protection against other power problems, they do not help in the event of a blackout.  In practice, many people tend to prefer to employ uninterruptible power supplies.