The 2-Pack + 1 Box combo gives you more washes for the money. Saves on purchase price and shipping.
2-Pack Scented SaniSolution 120 Cartridge: Each Cartridge in the 2-Pack lasts for 120 washes/240 washes on Cat Activation. Each Cartridge is 4W x 7H x 1.5D. 15 Fluid Ozs. 2-Pack Weight: 4 lbs.
Each box lasts 4-6 months. Dust free, non-toxic combination of natural and synthetic biodegradable materials. Degrades in Septic Systems. 7W x 9.5H x 2D. Weight: 3.5 lbs.