Each group needs:

• top half of a two-liter plastic bottle
• coffee filter
• zip-lock sandwich bag
• 2 plastic cups
• A Matter of Leaching Worksheet, one per student

To share with the entire class:

• sand (approximately 5-10 pounds)
• gravel (approximately 5-10 pounds)
• cotton balls
• screening (one to two 4"x4" squares per group)
• activated charcoal or carbon (optional, can be purchased on amazon.com or at some garden centers)
• garden soil, not potting soil (one handful per group)
• permanent marker