Hi, Tim,

Please disregard the advice you received from the bystander. He is wrong.

Sam's Club's Clorox is relatively cheap so I'll try your approach for a few days. I'm curious about what will change to enable the Cl to remain up if I don't add CYA.
Nothing. Your Cl that you add at dusk will work on the organics at night and be killed off completely by the Sun the next AM. The CYA protects the Cl from the Sun to an extent.

The issue is that if you put in CYA now, it sits in your filter and dissolves over several days.....you should be backwashing during those several days so you will simply backwash your undissolved CYA out of the pool.

Reread the method. Cl at night to protect it from the Sun, then CYA when your pool is clear and you've finished the frequent backwashing.

Many, many, many folks, "try" this method for a few days and fail. They simply underestimate the amount of Cl needed to sanitize the pool. They "tiptoe" up on the problem rather than hitting it with a baseball bat.

Test and add Cl...Test and add Cl....Test and add Cl.