Fluval AquaClear AC 20 Hang On Power Filter 379 L/H - For Aquariums up to 76 L #19595

Unsurpassed 4-Stage Aquarium Filtration

Built on a 40-year legacy of engineering reliability, the next-generation Fluval AquaClear AC20 Hang On Power Filtersets the gold standard for compact hang-on-back (HOB) aquarium clarity. Featuring up to 7 times more filtration media volume than standard competing units, it ensures superior contact time for biologically stable, crystal-clear water.

The re-engineered AC20 clip-on system features a reconfigured media basket with custom fins that cycle your tank water through four dedicated stages:

• 1. Pre-Filter Stage: The intake strainer sponge traps large debris and stringy algae filaments while keeping small fish, fry, or shrimp entirely safe from the pump intake.
• 2. Mechanical Stage: A high-density 30PPI Bio-Foam insert mechanically traps fine particles and organic waste while establishing a massive footprint for beneficial bacteria.
• 3. Chemical Stage: Premium Activated Carbon completely eliminates foul odours, water discolouration, and heavy impurities to create clear water.
• 4. Biological Stage: The highly porous BIOMAX ceramic rings support massive colonies of beneficial nitrifying bacteria to neutralize toxic ammonia and nitrites continuously.

Key Features & Performance Upgrades:

• Patented Refiltration System: An adjustable flow control slider lets you dial down water velocity by up to 66% for delicate fish varieties like Betta fish or livebearers without putting strain on the motor unit.
• Quieter Operation: Features a reconfigured rotor configuration and precision motor design to dampen vibration, eliminating the typical "humming" or rattle common to older filters.
• CycleGuard System: The independent, modular media blocks let you swap out single filtration stages without disrupting your established nitrogen cycle or killing beneficial bacterial colonies.
• Versatile Application: Fully optimised for both freshwater aquariums and marine saltwater setups.

Product Specifications:

• Brand: Fluval AquaClear
• Model Number: 19595 (Replaces legacy AquaClear 20/Mini / A595 models)
• Maximum Flow Rate: 379 Litres per Hour (L/H)
• Aquarium Capacity: Recommended for fish tanks 18 Litres up to 76 Litres
• Power Consumption: 5 Watts / 240V Australian Plug
• Dimensions (L x W x H): 12.9 x 11.1 x 16.3 cm

Frequently Asked Questions (FAQ)

How often should I clean or replace the Fluval AC20 media inserts?

Stagger maintenance to protect the biological cycle, rinsing foam every 2–4 weeks and replacing it semi-annually, changing carbon monthly, and rinsing BioMax rings monthly while replacing them partially every 6–12 months.

Is the AquaClear AC20 quiet enough for a bedroom tank?

Yes. The latest generation AC20 model features an upgraded sound-dampening top cover to absorb the echo chamber effect, paired with a reconfigured impeller layout. This combination minimises vibration and noise despite high water output.

What should I do if the filter rattles or fails to pump water?

If the unit rattles or loses suction, unplug the unit and check the motor unit housing. Debris, sand grains, or hard calcium buildup can occasionally stall the magnetic impeller wheel. Use a dedicated Fluval Impeller Cleaning Brush to scrub out the inner impeller well and intake pipe to instantly restore full flow rate velocity.

Can I use the Fluval AquaClear 20 filter in a saltwater tank?

Yes, the AC20 is fully compatible with both freshwater and marine saltwater setups due to corrosion-resistant internal components.