Kitty Litter Landfill Cart Never Flush Down the Toilet Harmful parasites live in your cat’s waste and can end up in the pipes and septic system. Even if it’s labeled “flushable”, don’t flush it down the drain. Throw It into the Trash The best way to dispose of kitty litter is to scoop waste into a bag, tie the bag tightly, and then throw the whole thing into the trash. Ways to Reduce Yesterday's News Original Cat Litter Silica and clay litters don’t decompose and can also be harmful for your feline. Try using a newspaper litter that is biodegradable like Yesterday’s News Original Cat Litter. Ways to Reuse Use Clean Extra Litter as Mulch If you have extra litter that is biodegradable, use it as mulch or garden fertilizer.