Question on bottom drain and pop ups

[slater1182]

I have a pop up system and bottom drain. High winds put a lot of leaves in the pool. the bottom drain does not seem to be working.

How can I clean the bottom drain unit? I have cleaned all above ground filters but pool is not self cleaning.
What are the steps to increase suction or cleaning power with bottom drain system?

I added a picture of bottom drain.

many thanks

ps I just uploaded a video link to be used later, when i have more questions
http://www.youtube.com/watch?v=c1jykr21JVY