Using the black coal filter and plastic housing. ..

Hello,

Is it necessary to use the coal filter and plastic housing it goes into to still use my Keurig K75 Platinum machine??

Someone gave me the machine because they got a new one. ..,but there was no manual with it. I have downloaded the manual but it doesn't say whether or not you absolutely have to use the filter. It says something about "If you are using the filter " So I am not sure.

I was washing the tank and didnt realize the filter was there and got a little bit of soapy water into it. I also have no idea how old the filter is....but I am betting it is due to be changed.

Thank You for your time. ..