The only thing you have to replenish is the cleaning solution. The descriptiong says it lasts for about 32 cleanings.
http://www.micromatic.com/draft-keg-...pid-CFP-1.html
You are spending the $88 on the system... which you can use for many years. It's basically a little mini keg that you put the cleaning solution in. You unscrew the cap, put the cleaning powder in and fill it with water, screw the cap back on and tap it like you would a keg with your coupler and turn on your CO2 to pressurize so you can run the solution through the beer line.
It's pretty cool. I have one and like it. In addition to that setup, I also bought the "S" compatible cap, which seemed very expensive, but I drink a lot of european beers and didn't want to have to change to the "D" coupler every time I clean.