The biggest improvement you can make is to stop feeling your cat dry food. They're often a large % fibrous plant matter, which ferments, causing much of the smell. If you're up for making homemade cat food, rather than canned, that makes their poop smell even less. The other thing you can do is make a litterbox like this:

- 30 gallon plastic bin (look for one with flat sides, not a "heavy duty" model with ridges along the side -- if your cat is a side-pee-er, this will be difficult to clean).

- Cut a hole in the side with a utility (aka x-acto) knife, 9 inches from the bottom.

- Fill with 3.5-4 inches of unscented, clumping litter. I've tried Dr Elsey's and World's Best, and prefer the former, which I found clumps better; I believe other clay-based litters are equivalent to it.

- Buy a litter-lifter, it's the best scoop, hands down. After I tried it the first time, I actually placed a bulk order (25 scoops) so that I have a guaranteed lifetime supply (and for gifts), because I never want to use another scoop.

- Clean the litter box at least once per day. I know this sounds like a lot, but it's actually not -- with the scoop above, it takes me ~10 seconds per "item" (pee ball or poop cluster) you scoop out (unless your cat is a side-pee-er), plus maybe 30s moving the litter around to find the items and even out the litter at the end. (I've timed this; in total it's around 1 minute if I scoop once per day).

Info is sourced from https://catinfo.org (specifically https://catinfo.org/the-litter-box-from-your-cats-point-of-v... and https://catinfo.org/making-cat-food/#Constipation ) and verified by personal experience.

Also nice we all have heavy duty masks for cleaning them too!