The 3-Pack + 1 Box combo saves you money. You save on the purchase price as well as the shipping.

3-Pack Scented SaniSolution Smart Cartridge:
Each Cartridge in the 3-Pack lasts for 60 washings. Each Cartridge is 4" x 7" x 1.5". 15 Fluid Ozs. 3-Pack Weighs 7 lbs.

Washable Granules:
Each box lasts 4-6 months. Dust free, non-toxic combination of natural and synthetic biodegradable materials. Degrades in Septic Systems within 9 months. 5" x 10" x 2.5". Box weighs 3.5 lbs.