There are options, and it is usually OK to swim in higher chlorine levels, depending on how high you go. You probably know how much chlorine you lose each day, and if no one swims in it and it is covered, you will probably lose half that, so plan accordingly for the number of days you are gone. If someone is going to swim in it, have them pour in some bleach when they are done.

You could also add some polyquat algaecide before you leave, do some research on this forum on how to use that.

Other options include installing a SWCG since you seem to be gone a lot in the summer, or some other form of chlorine injection system (beyond my scope).

Lastly, using pucks is not bad, and probably your best option for your situation. You know it will add CYA, so you can deal with that as you need to, but you know your pool will be sanitary while you are gone and other people are swimming in it.