Materials not to compost:

• Meat and fish.
• Carcasses of shrimps, lobsters, crabs.
• Oyster shells and other molluscs.
• Bones.
• Fat and oil.
• Dairy products.
• Ash.
• BBQ briquettes.
• Content of the vacuum bag.
• Cat litter (It may contain pathogens).
• Other human or animal feces (They can contain pathogens).
• Rhubarb leaves (stems can be composted) The leaves of rhubarb contain oxalates, which are unstable salts of oxalic acid. They produce a highly toxic acid.
• Oak and walnut. It contains a lot of tannic acids. It is best to put them under the trees.
• Diseased plants, with rhizomes or treated with pesticides, seeds (such as quack grass and poison ivy).
• Dryer lint.