Need a filter for this old vacuum - Electrolux EL7020A Oxygen 3 Ultra Canister Vacuum Cleaner Bagged Vacuum

Go to your local hardware store or chain store with your old filter and the make and model of your vacuum written on a piece of paper.
They should have what you are looking for.

How old? If fairly new you should not need brushes, bad brushes would probably not allow the vacuum to run at all. Last time you changed filter? Sounds like the cover to the filter is not closing well enough. There's also possibility you have a clog in the wand or hose.

no most arnt supposed to spin unless you have some weird type. but i have never seen one spin. sounds like the old one was in wrong.

Apparently manufacturing / sale of the filters has been discontinued.
See the following link:

http://www.epinions.com/review/pr-Black_Decker_SV3000R_Upright_Vacuum/content_159838015108

Perhaps you could bring the old filter in to the hardware store and try to buy a similar type then custom trim it by hand to fit.

Have you ever replaced the belt? That is most likely the reason that it is not picking up like it used to. You are actually supposed to change the belt yearly. Here is the belt you need and the manual which has instructions:

Dyson DC07 Belts and Manual

The cover for the HEPA filter is located immediately beneath the clear bin, and is exposed when you remove the bin. Removing the filter cover without breaking something can be a bit of a challenge, but if you look carefully you will see how it fits on, and then, with care, you can lever it off. Then the filter just lifts out. Don't worry if you do break the cover - the cost of a new one is nothing compared with the filter itself. You will need to buy a new adhesive seal too, as the old one will be stuck to the old filter.

You would not normally need to replace the filter unless it is damaged. Access is from inside the tank itself. Remove the bucket and locate the finger loop on the existing filter. Pull toward the inside of the bucket. Replace the filer by setting in it's track and snapping tight to the wall of the vac. Unless damaged you can save and clean the old filter for reuse.

take the dirt cup off the filter goes inside the dirt cup.once you have the dirt cup out twist the top and it will come off,take the old filter out put the new in then twist the cover back on and put it back on the vacuum.please leave feedback

If it is a NuTone system you should have a filter and a BAG in the tank. just got to their site and look up your model number to see what you need.

I would trade it in on an Aerus vacuum.