Wheat cat litter works well with the LitterRobot 4, but it leaves more residuals at the bottom. The clumps break down a little when dumped into the waste drawer. At the end, I show a picture of how the bottom looks after a week. The brand I used was sWheat Scoop FastClumping Unscented. Get it here https://prf.hn/l/41QjwBq
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