Filters · hob
Fluval AC20
Manufacturer-rated for 5–20 US gal aquariums.
Four-stage hang-on-back filter with adjustable flow, a reusable media basket, and maker-rated maximum flow.
Specifications checked with the manufacturer on 2026-09-07.
Consider: The media basket lifts upward. Leave unobstructed space above the filter so routine cleaning does not require moving the tank.
US product record · Model / item 19595. Confirm the model and package contents before purchase.
Specifications that affect fit
- Manufacturer capacity
- 5–20 US gal
- Power
- 7 W
- Supply voltage
- 120 V / 60 Hz
- Dimensions
- 5.1 × 4.4 × 6.4 in (L × W × H)
- Pump output
- Not specified
- Filter circulation
- Not specified
- Maximum flow
- 100 GPH
Use the exact nameplate watts and your real schedule in the aquarium electricity cost calculator. Leave an unpublished wattage blank.
Pump output, filter circulation and maximum flow describe different test conditions. These figures do not establish the flow in your installed aquarium.
Before choosing this model
- Confirm item 19595 and the AC20 size.
- Measure rear and overhead clearance before buying.
Still to confirm
- Maximum rim thickness is unresolved. For a thick-rim tank, inspect the exact mounting fit before buying or compare a filter with a stated rim limit, such as the Fluval C2.
Read the equipment selection guide alongside these model details. A rated capacity does not settle livestock needs, room conditions or physical clearance.
Choose and care for mechanical, biological and chemical media before buying replacement supplies.
Included items & upkeep
- Bio-Foam
- carbon
- BIOMAX
- intake sponge
Plan for the routine work
- Unplug before service.
- Follow the AC manual for media order, basket service, and impeller cleaning.
Enter your own supply prices and replacement schedule in the first-year cost planner. Use the exact manual for maintenance intervals and service steps.