So I read about using bleach to shock. My CYA is 20 so according to the table, I can shock with a FC of 12.

Over the last three days and multiple trips to the grocery store, I have added 22 gal of bleach to my 30,000 gal pool. Yet my chlorine is barely 5!.

I am using sodium hypochorite bleach and the bottle doesn't give a concentration but if it was 6% shouldn't I have a chlorine level of like 40?

My pool is uncovered and I recognize the the UV is degrading my chlorine with such a low CYA (I was going to add the CYA after the shock) but surely it doesn't disappear that fast?

Any thoughts? With the $ I've spent on bleach so far, I could have bought shock from the pool store which I'd sworn I'd never visit again.

Thanks,

Steve