Cassie doesn't usually bury her stools very well, so I scoop and flush them. The plumber told me to do this only if they're not covered with litter. The ones she does bury, I can't put in the toilet. When I empty the whole box, though - it goes in a plastic bag, then in another bag, and goes out with the regular trash. I'm with purr-tender - I consider the reuse of plastic grocery bags for litter pan management as a form of recycling.
From the Sorptive Minerals Institute, www.sorptive.org:
Is Discarded Clay Mineral-Based Cat Litter Clogging the Nation’s Landfills?
Rather than clogging our nation’s landfills, clay mineral-based cat litters are actually helping to protect the surrounding environment. By law, the construction of most landfills begins with the installation of a liner made from compacted clay. In most land fills the clay used for this purpose is sodium bentonite, the same material used in clumping cat litter. The compacted clay forms a very low permeability barrier that prevents contaminated water inside the landfill (leachate) from seeping out and contaminating nearby soil and groundwater. The strong attraction of sodium bentonite for many types of contaminants also helps to remove contaminants from the small amount of water that does escape from the landfill. This keeps potentially harmful materials contained within the landfill. Discarded cat litter acts in much the same, helping to seal the contents of the landfill and remove contaminants from landfill leachate.
Although the sodium bentonite in clumping cat litter has the capability to swell significantly when in contact with water, its swelling is limited to the empty space available for it to swell into. As a result, clumping cat litter can only swell into existing air space within the landfill. This helps to further seal the contents of the landfill by eliminating the air space through which leachate can flow. Swelling of wetted clumping cat litter within a landfill cannot increase the volume of the landfill.
The most recent studies of waste materials entering landfills, as published by the Environmental Literacy Council (2008), indicate that approximately 26% is paper products; 18% is food scraps; 16% is plastic; 9% is rubber, leather or other textiles; 7% each is yard waste, metals, and wood; and 6% glass. Cat litter falls in the “other” category, which is approximately 4% of the total.* Although millions of pounds of clay mineral-based cat litter is sent to landfills each year, the data from these studies shows that it represents a tiny fraction of the total solid waste materials in landfills.
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