pump running 24/7 is not too bad, but as Jason says, when you shut that pump off for a while and then restart it, you get a big slug of chlorine through your pump....not good. Additionally, that big slug of chlorine can concentrate in your skimmer and sort of "bleed" out over the mouth of the skimmer and bleach your liner just below the skimmer.
You should just use bleach or install a chlorinator if you're dead set on running pucks.