Bleach is actually better to use. But it’s hard to maintain a good level in my experienceWoodman's or the dollar store for 1 gallon bleaches. Just the plain old non scented, non concentrated sodium hypochlorite. Been using it for over a decade now and it doesn't add any dissolved solids to your water like the pucks do.
All depends on the size/gallons, usage and weather, my pool is 24" round and 54" deep. In the past when I only used 2 chlorine floaters, a 45lb bucket of 3" tabs usually got me thru the summer. Last year with the new pool, I tried a chlorine and mineral sanitizing system. I like it a lot, but I also like to keep my chlorine on the higher but still safe side. So I used one chlorine floater as well and might have used 15lbs of 3" tabs.how much chlorine tablets will a pool use in a summer?