Cant make a decent cup at work :(

[corbypete]

Can anyone tell me how to make a better cup of coffee in a plunger??

I love coffee from a filter machine, even the cheapest £6 models from Argos makes a quality brew.
But at work, no matter what beans I use, I can never get a decent brew.

At home I make a nice deep, cleared, filtered coffee, with a proper 'costa shop' taste.
At work, I have dusty, bitter swill that has sludge on the bottom of every cup, and tastes vile. I have to go to the coffee vending machine just to get my taste buds back!

I thought maybe I had gone off coffee after 3 years of drinking the real stuff, but after buying a coffee machine at home I couldnt get enough.

Any tips appreciated, maybe I'm asking too much of my caffetierre??

 

[CafeBlue]

It sounds like the grind is too fine and that the coffee is stale.
Try again with fresh roasted coffee, ground just prior to brewing. Grind tol a coarse setting - just a bit coarser than percolator. Press the plunger down slowly, after steeping for three minutes.