TekSupply 112103 Wonder Soil Expanding Wafers 0.50 in - Bag of 1000 Available in a variety of forms and sizes for all gardening applications. This dehydrated&#44; compressed medium will expand up to 9 times its volume when water is added. Reduces watering and fertilizing costs by up to 50 percent. Produces a soiless medium with a perfect balance of water-to-air ratio. Completely safe for use around children and pets.