Are you finding your vacuum isn't working like it should, leaving behind stuff on your carpets. Maybe it's time to check the roller brush.
Yep, that's the problem
When your roller brush has that much hair string and other things attached to it, it cannot function the way it needs to so go grab a pair of scissors and a bag to dispose of the debris (I put mine in a compost pile so I use a container). You will also need tweezers (you can use your fingers to pull) and patience
Just keep cutting a little at at time and pulling what you have cut. Keep repeating until your roller brush is cleared of all attached debris. Use your tweezers to get in the bristle to remove the tiny pieces of debris and wipe down with a damp cloth. If really dirty use soapy water to clean but make sure you wring out your cloth well before using
Once done, you should notice a big improvement on the performance of your vacuum.