WASHINGTON (WUSA) -- Is your morning "cup of joe" tasting a little bitter lately? It may not be your imagination.

The first thing you should try is decalcifying your pot. There are easy directions you can find online for this process which involve using a home-made solution of vinegar and tap water.

The next step is to look at your can of coffee. Reuters reports that many of America's major brands have been quietly tweaking their coffee blends. The reason is cost.

Evidence suggests they're now substituting lower-grade Robusta beans for some of their pricier Arabica. Arabica sales are down 27 percent year to date -- while Robusta bean sale are up 25 percent. That, in turn, is degrading the quality of the coffee you are spooning into the pot.

Massimo Zanetti USA -- roasts for both Chock full o'Nuts and Hills Bros coffee. It publicly confirmed a shift to Robusta beans.

So if it's tasting bitter -- it may not be your old coffee pot after all.

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