Instructables
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 with baking soda.
The cat urine flows through the non-porous pea gravel into the second tray where it is absorbed by the news and the odors are neutralized by the baking soda.

All you have to do is scoop out the solids from the pea gravel once a day and change out the newspaper and baking soda once a week.
Once a month or so you change out the gravel. The gravel is hosed off or dumped outside where the rain cleans it and it can be reused.

My cats had to be trained to go on the gravel.
I put regular cat litter on one side of the box and pea gravel on the other side.
There was some mixing of the two as the cat used the box.
Then I gradually used less litter and more gravel.
Now my cats use the new system with only pea gravel and my life is a little easier

Green Pee Cat Litter System is green because it:
1- Stops all the cat litter going into the landfills.
2- Saves the cost of buying cat litter.
3- Recycles newspaper.
4- Saves time changing out cat box.
5- Helps control odor.
 
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Step 1: Drill holes in one tray

Picture of Drill holes in one tray
Holes are drilled in one tray

Step 2: Newspaper and baking soda are put in the bottom tray

Picture of Newspaper and baking soda are put in the bottom tray
Newspaper and baking soda are put in the bottom tray

Step 3: The trays are combined

Picture of The trays are combined
The trays are combined

Step 4: The cats are trained

Picture of The cats are trained
The cats are trained by using pea gravel on one side and cat litter on the other

Step 5: The gravel and litter mix as the cat use the box.

Picture of The gravel and litter mix as the cat use the box.
The gravel and litter mix as the cat use the box.

Step 6: Eventually you can use only gravel.

Picture of Eventually you can use only gravel.
Eventually you can use only gravel.

Step 7: Separate the trays to clean the bottom section

Picture of Separate the trays to clean the bottom section
Separate the trays to clean the bottom section

Step 8: Dump the newspaper and install new paper and baking soda

Picture of Dump the newspaper and install new paper and baking soda
Dump the newspaper and install new paper and baking soda

Step 9: The gravel is dumped once a month or so in an area that it can be washed and reused

Picture of The gravel is dumped once a month or so in an area that it can be washed and reused
The gravel is dumped once a month or so in an area that it can be washed and reused