The marina 3 in 1 battery operated aquarium multi vac provides a quick and easy way to keep your aquarium clean without the need for a plug simply push the start button and the multi vac jumps into action for stress free cleaning the marina multi vac comes complete with a side bag that easily traps any debris the marina 3 in 1 aquarium multi vac offers 3 potential uses 1 gravel cleaner cleaning silt and sludge from the gravel bed 2 algae remover to remove stubborn algae from the aquari