Wow. I'm just getting here from the other thread.

The only thing I'll add at this point is that I have been where you were, wondering if I'll ever get a FC reading in my pool again. When you have problems like you have had, it's important to understand how important it is to KEEP THE FC AT 20 PPM until it holds.

You are fighting a war and CL is your ammunition. But, you're using it up as you fight, so you have to continuously and constantly RELOAD.

In the near future, your water will be clearer than ever before.

You're getting good advice; follow it. My post is really for encouragement.