Sunny,
You really need to check your information before giving out advice.

I've never heard that if FC is 10 or higher that CYA cannot be measured. I don't know where you got that from and I would never advise it.

Further, what high FC DOES do is cause pH readings to appear high--that's why you need to use the R-0014 for the pH test, not the R-0004 when the FC is 10 or higher. If your FC is, say, 30 and your pH is 8, then trying to drop your pH to 7.2 will actually drop it far lower PUTTING YOUR LINER AT RISK!

You can also add a couple of drops of chlorine neutralizer before you test.

Then you give advice to raise FC to the shock level. How do you know what the shock level is if you can't measure CYA with FC at 10?

Further, one does NOT need to add chlorine every 2 hours when fighting a bloom. Testing and adding chlorine 3x/day is enough.

Brushing "a lot"? Brushing and vacuuming (to waste, not to the filter) once a day should be sufficient--and it's plenty of work as it is!

While an algae bloom is a pain the lower extremities, it is still possible to clear it up easily without working oneself to a frenzy. If you work, you cannot be checking and adjusting FC levels every 2 hours. The whole idea of our systems is to keep things as simple as possible.

We have more than one stickied thread on how to clear an algae bloom. It's not hard and you don't have to drive yourself crazy. You DO have to be consistent and persistent.