Cannot raise CYA

[QiingGuy]

There is something in your pool causing high CC. This is what is using up your chlorine. It could be the same thing that is consuming your CYA as well. You need to shock the pool and keep it at shock levels until FC equals TC and FC holds overnight.

Forgive my ignorance how do I shock it? Currious that the only notes from the pool store (wife took it in) was to lower pH using MA. EDIT: Just read the manual for my SWG and it says I can use it to shock the pool by pressing the boost button. It will run 8 times the normal time so in my case 16 hours. Also, I read and realized I've been running my SWG one hour short every day for my current temp I need to be running it 3 hours vs. 2. So, press the boost button and let it run 16 hours to shock or is there another way?

Also, this is what my SWG looks like. Could the white stuff have anything to do with chlorine not being made? When it's on it does bubble which the manual says is it making chlorine.