What to do with used cat litter?

I suppose there are risks to using any type of fertilizer, but what I pit on my flowers and my veggies are 2 different things. I am very particular to what I put on my consumables because I like to be able to munch straight from the garden, however, things do grow well in the compost pile, squash have grown there as well as tomatoes from seeds that were in there already.

I was at the grocery store yesterday and saw flushable. I wonder what type of repercussions it would have on your septic system if any. It says it is safe, but I definitely wonder.

I hate the sight of cat litter so I get a spot where I dispose them off. My assumption was this is not degradable and the thought of mixing this with compost has never crossed my mind.