The Aqueon QuietFlow 75 LED Pro Power Filter features four stages of filtration–mechanical, chemical, biological and wet/dry–for the cleanest, clearest, healthiest water. Higher flow rates ensure higher dissolved oxygen content for healthier, more active fish. The internal pump design helps dampen noise, eliminates leaks and starts up automatically after cleaning or power interruptions.This new Aqueon QuietFlow Power Filter version includes an LED light that flashes when the cartridge becomes clogged, indicating it is time for replacement. The batteries are included for this feature. For aquariums up to 90 gallons. Related Products: Aqueon QuietFlow Aquarium Filter PartsI Aqueon QuietFlow Aquarium Filter Media.