Product Description The Oil Eradicator is a unique foam carrier that contains billions of oil-eating microbes. The foam is water resistant, but attracts and absorbs oil. Dormant microbes in the Oil Eradicator become active when petroleum pollutants come into contact with the foam and then bioremediation begins. Bioremediation is Nature's way of recycling. As they digest the oil, the microbes convert the hydrocarbons into water-soluble fatty acids that are then safely consumed by fish and other aquatic animals. Rest assured these microbes are not some genetically engineered super-bug, but rather a naturally occurring combination of beneficial Archaea microbes, each strain having been identified for it's conversion of specific hydrocarbons. Using the Oil Eradicator is an environmentally sound way to eliminate pollutants found on water surfaces in bilges, marinas, and waterways. With a shelf life when sealed of five years, you can keep the Oil Eradicator on your boat until you need one. Once the microbes are activated by water, motion, oxygen and pollutants you can usually expect between 60 and 90 days of active bioremediation. The Sardines come in a three pack that is designed to provide a full season of protection for a 15-30 foot boat. Ideal for boats with multiple bilge chambers. A handy attached string makes it easy to tie off the Oil Eradicator so it won't move around, or if you have a deep bilge you can easily retrieve the unit when it has done its job. The polyethylene foam should be discarded responsibly on land when it's time. The Sardines each measure about 5 1/2" long x 1 3/8" wide x 1" thick.