Makes partial water changes easy and effective with minimum effort. A couple of squeezes on the hand pump is all that is needed to get the pump working. While emptying water from the aquarium the cleaner pump will also suck up dirt and debris from the bottom. The cleaner pump can also be used to pump water back into the aquarium, eliminating the need to struggle with heavy buckets of water. Use with the BiOrb 8 Gallon Aquarium (item #86387).