I have a 90L550A Shop-Vac. I have had for several years and never used it. I want to use it to vacuum my basement which has lots of dust, cobwebs, not a finished basement. Do I need a filter…a disposable filer bag ? If so, what part number ? The van has a cartridge filter. Do I also have to buy a foam sleeve and reusable dry filter ? Sorry for all the questions but I can't find the manual. Thanks you very much. Phyllis