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...cat litter industry has grown into a multi-million dollar business. Sales for 1994 were estimated at $767 million, and are expected to increase significandy throughout the decade.
Clumping litter was introduced in 1989 and accounts for approximately 30% of today's cat box filler market.
Cat box fillers made from absorbent clay account for approximately 95% of all cat litter. Clay, a naturally-occurring, nonmetallic substance, is composed of a combination of aluminum silicates and minerals.
Aluminum silicate, also known as aluminium silicate, is a mixture of aluminum, silica, and oxygen that can be either a mineral, or combined with water to form a clay. It can also combine with other elements to form various other minerals or clays. Some of these forms are used medicinally and industrially. They retain their strength at high temperatures — a property known as being refractory.