In real-world use, an 8 lb bag commonly lasts about 3–4 weeks to a month for a single cat. Some manufacturers advertise up to two months, so actual longevity can vary by usage, cat, and how the litter is maintained.
Crystal litters are typically made from silica-based crystals (silica gel), while pebble-style formulas often use natural diatomaceous earth pebbles — both are listed in product material descriptions.
Non-clumping crystals absorb moisture and trap odors, so you generally scoop out solid waste and stir or rake the crystals daily. Reviews and descriptions note fewer full-litter changes are needed compared with some other litter types.
Several listings are labeled for multiple pets or note multi-cat strength. Descriptions and reviewer feedback indicate these formulas tend to provide longer-lasting odor control and make maintenance easier in multi-cat homes.
Product descriptions indicate natural pebble formulas are compatible with all types of litter boxes, including crystal-style self-cleaning boxes.