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The Green Pee Cat Litter System uses a non-porous filler, pea gravel in a perforated tray sitting in a second tray that contains an absorbent layer of newspaper ...
Holes are drilled in one tray
Newspaper and baking soda are put in the bottom tray
The trays are combined
The cats are trained by using pea gravel on one side and cat litter on the other
The gravel and litter mix as the cat use the box.
Eventually you can use only gravel.
Separate the trays to clean the bottom section
Dump the newspaper and install new paper and baking soda
The gravel is dumped once a month or so in an area that it can be washed and reused
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