There are many valid reasons to avoid the use of commercial cat litters. Expense, Health concerns (Clay based litters are thought to have a carcinogen in them, and they can create allergy and asthma problems).
Environmental and safety concerns - Clay for the kitty litter is strip-mined while flushable litter may contaminate the water.
How many #homesteaders and #thealliance members make their own? eg. a combination of chicken feed, baking soda, and cedar shavings.... or sand, or newspaper clippings: https://cats.lovetoknow.com/Homemade_Cat_Litter