I use liquid bleach most of the time. When my CYA gets near the lower range of where I operate my pool, I use 3" stablized pucks in my skimmer and when I am away, in a floater.

***Never add bleach into skimmer when you have pucks in the basket*****

Using the pucks later in season cuts down on how much acid I have to add to my pool water to keep PH in acceptable range.