isnt it Cell-SORB Plus®? and just to play the other side of the fence. maybe he let it stay soiled for longer then normal given the claims of the substrates amazing ability to absorb feces and kill odour? He could have even thought it was unsoiled if it does what it says and absorbs odour. Urates and Urin wouldn't smell causing them to be overlooked rather then cleaned, especially if the urates were able the drop to the bottom of the substrate like there add claims.
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