The only thing I've noticed thru the years is the food they eat really affects the smell. Different brands make their litter box smell differently. It sounds like you are happy with their food, so switching just for the sake of smell might not be an option.

You probably already do this, but I scoop the litter box twice a day and that really helps with the smell. Morning and evening and also if I happen to notice there is stool in there. I also keep a really good odor absorbing gel (like an air freshener) in the cat box area...
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Tammy and Pookey
(Stanley 8/91 - 8/07)

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