Featured is a LED filter cartridge change indicator light that flashes when the cartridge becomes clogged with debris, providing a reminder that it's time to replace the cartridge.

A great benefit of the Aqueon QuietFlow filters is the internal pump design that helps dampen noise, eliminates leaks and because it is self-priming, starts up automatically after cleaning or power interruptions. Higher flow rates also ensure a higher dissolved oxygen content for healthier, more active fish.

There are five total stages of filtration–mechanical, chemical, biological and an additional specialty pad–for the cleanest, clearest, healthiest water.

Stage 1 - Biological - The QuietFlow LED Pro's patented filter cartridge features dense floss that effectively traps dirt, debris, and particulates from your aquarium water.

Stage 2 - Chemical - Water is forced through the QuietFlow LED Pro's filter cartridge where the premium activated carbon effectively removes toxins, odors, and discoloration. Cartridges contain 25% more carbon than competing brands to help you maintain a flawless aquatic display.

Stage 3 - Biological - The QuietFlow LED Pro features a patented biological grid that provides a large surface area for the propagation of bacterial colonies. As water passes through the bio-holster, toxic ammonia and nitrates are actively removed by these beneficial bacteria.

Stage 4 - Wet/Dry - Water flows into the diffuser grid which removes additional toxins. It also increases dissolved oxygen levels, promoting increased fish activity and vitality.

Stage 5 - Filter Pad - The replaceable specialty filter pad adds extra filtration to water prior to returning it back in the aquarium.