AF 435 Sump

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$419.99 $599.99

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Thoughtfully designed with efficient filtration for marine aquariums

  • Highly durable, scratch-resistant PVC construction
  • Designed by experienced aquarists
  • Cascading chambers for quiet water flow
  • Adjustable removable divider with silencing combs
  • Dedicated filtration chamber with two removable socks and silencers
  • Integrated RO chamber with lid for auto top off system
  • Water level marks for easy skimmer regulation
  • Integrated anti-vibration foam
  • Thoroughly tested for water tightness 


Aquaforest sumps have been designed to deliver efficient filtration with long-lasting durability for marine aquarium systems. These versatile sumps feature adjustable and removeable dividers, cascading chambers, high-quality silencing combs, and a generously-sized ATO chamber with lid. The dedicated filtration chamber utilizes a cascading design that filters water first through a polishing sock, then through a media sock (both included). Each sock is topped with a silencing lid for quiet operation. The filtration chamber has been sized so that the included socks can be swapped out for AF media reactors (sold separately) or other equipment, if preferred. 




Overall - 23.6"L x 18.3"W x 17.7"H

Return Pump Chamber - 10.24"L x 4.61"W

Skimmer Chamber - 10.24"L x 9.21"W (12.32"W without baffle)

Filter Chamber - 3.94"L x 16.30"W

RO Chamber - 5.31"L x 17.09"W



What's Included?

1x AF435 Sump

2x Filtration sock frames

2x Filter sock silencers

1x RO chamber cover

1x Divider with comb & 2 screws

1x Filtration sock

1x Media sock


More Information
UPC 5902026732765
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Product Questions

What fleece roller works with this sump
Question by: Jean-Paul on Feb 3, 2024, 8:28 AM
Hey there,
Thank you for reaching out to us. Since the filter chamber is 3.94"L x 16.30"W i would check out the Klir
Di-4 Drop-In Fleece Filter System V2
SKU 251941

The same Klir Di-4 Filter Drop-In Fleece Filter System that you know and love, but with an upgraded magnetically mounted optical sensor and Smart Controller!

NEW Magnetically mounted triple optical sensor
NEW V2 Klir Smart Controller
90 degree hinge to fit in tight areas
Compatible with most 4" filter sock holes
Includes 25 yards of 50-micron fleece
Fully automatic with smart controller
Removable lid with carbon insert for noise and odor control
Multiple units can be placed side-by-side
Never have to deal with dirty fliter socks again!
This automatic fleece roller will fit in most sumps with a 4" filter sock tray and will eliminate the need to replace filter socks. The included 50-micron fleece roll will help eliminate free-floating particles and automatically advance when the fleece starts to clog, exposing new fleece. The Di-4 has the capability of handling up to 750 GPH and producing crystal clear water.

Traditionally filter socks have been used to polish aquarium water from particulates and detritus, and now with the Klir Di-4 Drop-In Fleece Filter System, you can throw away your filter socks for good! The Klir Di-4 can hold up to 25 yards of 50-micron fleece allowing it to last for months at a time without having to be maintained in any way. The compact design and 90 degree hinge lets it fit in tight spaces, and since you only need to access it once every few weeks or months, having direct access like filter socks in no longer a concern. Some tanks may need to replace the fleece once every couple months where others may need to replace it more often, and that will depend on your bio-load along with feeding habits and a few other variables, but in most cases, a single fleece roll can last up to 3 months without having to be replaced.
Please let me know if you need anything further.

Answer by: Thomas Wofle (BRS Staff) on Feb 8, 2024, 1:53 PM