I had to grab some CYA to adjust up after refilling from winter.
There was woman in the aisle with bucket of Clorox 3" trichlor pucks - she looked a bit confused, then asked me if they were the same as the Walmart brand of pucks on adjacent shelf.
I glanced at active ingredients and confirmed they are the same concentration for ~$10 less.
She asked what I used after stating she throws a couple of these in a 33' ABG pool skimmer every week - nothing else
I tried to explain that it raised CYA level constantly if all you use is pucks - she appeared more confused.
Showed her where the bleach was and recommended she try some, and probably test her water. She thanked me for the help and moved on with the bucket of pucks
Then I realized how people end up with CYA levels over 200