Are you new to Goggle+ ? this will be very helpful for you. Check the original post UNDERSTANDING GOOGLE+ v2.0
Also you can check the following Chrome add-on which can help you to decide which Circles show up in your Google+ Stream. So if you want remove some people from your Google+ stream, you can add them to a circle and remove that from the Google+ stream.
Here is that Add-On
You can also check the following post
Digging Into Ripples