Did you know.....
Most vacuum cleaners in America today are 70% ineffective, because the bag is over 1/2 full. After the bag is 1/2 full, the vacuum efficiency is greatly reduced. Once your vacuum cleaner bag is 1/2 full you should change it.
Check the brushes of your vacuum cleaner, when placing a pencil on the base of your power head, the brushes should just touch the pencil and bend slightly as you turn the brush. If it doesn't you could be losing up to 50% efficiency. Adjust or replace the brushes if needed.