Ok, lets just take a step back for a minute and address these issues separately.
Shufen first.
We still really dont know whats going on with your FC level. I suspect Chem Geek is correct and you counted each drop as an FC ppm. If he's correct, you certainly shocked it to a high level, but i'm not sure you finished the process. Your CYA level is measured at 100 ppm, but it's most likely higher than that, there's no way to know. Your shock level is based on the CYA level, so without a good CYA number, we really dont know what it is. Until you drain some water and get your CYA to a manageable level, you will continue to have problems.
Mule;
How are you testng your water? I really suggest getting a good test kit like those recommended at TFP. Your CYA level is 30? How was that measured? If it truly is 30 ppm, an FC of 3.5 is not shock level. Your shock level is 12 ppm.
Now, what about all this back and forth about floc, clarifier, etc. All this stuff is useless if you still have active algea, period. You have to shock the pool properly, pass the overnight chlorine loss test, and your pool will clear, I promise. Go back and re-read pool school and read it again until you are thoroughly familiar with it. The most important 2 things here is that the CYA is at a mangagable level and you keep the FC at shock level until you pass the overnight loss test. Adding a little chlorine here and there will not clear the pool. You MUST hold the FC at that shock level until you have <0.5 ppm FC loss overnight. Measure the FC an hour or so after the last chlorine addition at night. The next morning, before the sun hits the pool, measure it again. If you lost more than 1 ppm, you not done. Bring the FC back up to shock level and hold it there until you pass the O/N loss test.
As I said above, all this extra "stuff" in the word will not help until the algea is gone. Floc will drop the crud to the bottom, thats what its designed to do. But, it wont kill the algea.
That being said, there MAY be an occasion to use a clarifier. I would not use floc, ever. It makes a big giant mess and can be a bigger mess to get rid of than the dead algea. If you want to use anything, use a clarifier. Basically, there are two types. One is a synthetic polymer. They work pretty well. BE WARNED. If you over dose, it can casue everything to become whats called a colliodal suspension. This will be a bigger mess and it is REALLY hard to clean up.
The second kind is a natural clarifier. It contains basically ground up chiten. It works the same as the synthetic, but you really cant over dose it, or so they say (I'd still be careful).
Swimu, I know your trying to help, but these chemicals you are advocating to help these fine folks get rid of their algea problem is really not helping them all that much. I'm going to be pretty blunt. Your advice is not consistent with what is taught at TFP. I know you can figure all this out and learn the methods taught here. Read though pool school a few more times and I think you will find the methods here are sound.