Check the listing for details. QuietFlow LED PRO 30 Aquarium Power Filters - Aqueon. Condition: New. Listed at 37.99 USD. 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 – Dense floss removes particles and debris. • Stage 2 – Activated carbon removes toxins, odors and discoloration. • Stage 3 – Patented Bio-Holster removes toxic ammonia and nitrites. • Stage 4 – Diffuser grid removes additional toxins while adding oxygen for more active fish. It also reduces splashing makes the return exceptionally quiet. • Stage 5 – Specialty filter pad option for additional carbon, ammonia reducer or phosphate remover. All filters use Aqueon Replacement Filter Cartridges and Aqueon Specialty Filter Pads. QuietFlow LED Pro 10 – Medium cartridge QuietFlow LED Pro 20, 30 and 50 – Large cartridge QuietFlow LED Pro 75 – two Large cartridges • LED indicator light flashes when it's time to change the cartridge • Filter pump is self-priming, just plug and play out of the box; filter will auto-restart if power is interrupted and restored • Provides mechanical, chemical, biological, and additional specialty pad filtration • High flow rates ensure a highly dissolved oxygen content for healthier, more active fish • Uses Aqueon Replacement Filter Cartridges and Specialty Filter Listing and template services provided by inkFrog