[Jeff Stanley]

grab a flashlight

shine in beer line directly above keg (a line you havent used in an hour or so)

see the bubbles?
those are foam-streaks in practice (if the line is black, or too dirty to see into, you need to replace those lines)

same bubble is sitting behind the faucet in the draft tower

every time you draw a beer you get shot of foam, a bit of clear, then shot of foam, then all-clear. go ahead: open the faucet and watch the beer fall into the drain. It will only take you about 20 seconds to do this, that is less than a pitcher; you can afford it. bubble pockets in action. Watch and learn

let me guess: if you use it often it isn't as bad

your pressure is too low for some beers. temperature probably varies from cold as hell to as high as low-40s.

First: do what everyone else has said and use a thermometer to insure you have cold beer (or more fun: use your palate)

want to eliminate it completely? not afraid to spend a buck? those inventory control guys are a draft guy's best friend. Quit the nickel/dime #$%* and just get it operating right (jeez micromatic, you cant type the word w o r k without editing)

add 3.5 ft of 3/16 hose to each beer line (4.5 ft if you have small or frozen glasses). set up a blender and run everything at 18-20psi. the ideal blend would be closer to 70-75% (which could be ordered) but the stock 60% units will do it if you sell through all kegs quickly. I bet if you called scott he'd set you up with everything you need (800.435.6950, no i dont **** for micro-matic, they loathe me on here). You'll spend <$700 at micromatic, $200 on cylinder deposits, plus about $1.50 per keg on nitrogen gas (make sure there arent any leaks). this is per-bar.

Get a tech with pride in his **** to install it, hoses that long in a keg box can be a mess if you hire the wrong guy.