As a test, I suggest you switch the filter element to a different type, for example a paper filter. See if the water still has that taste. If so, and that's the only water in the house that tastes like that, then the problem must be with the new hardware or the installation. If the taste goes back to normal, then obviously, it's the filter element.
Did the installer use any pipe thread compound or such stuff that could taste bad? Teflon tape can be used and it has no taste.

no I installed it myself didnt use any telphon or dope, its installed with cpvc but last yr when i installed it was fine we closed down house for winter and i removed both filter and holding container when we returned i just replaced the container without filter then after 3 months i realized that i didnt put a filter in so I did when i removed the container it was clean so i just wiped it out with clean cloth. its the same type filter that i used last fall. i guess i'll try a different one I'll let you know how i made out thanks for you reply sharon

I suspect a new filter will help. You might also want to run the container through the dishwasher or clean it with some vinegar.