UP21 Sumpro Sump

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Sumps are a great addition to any fresh or saltwater tank. From adding additional water volume to area for heaters, reactors, probes, and any other life support equipment you may want to add. Many tanks are already drilled or can be drilled for a sump to be added.

Skimz Sumps are by far one of the best sumps for the money and packed with features all reefers will value.

  • Dimensions: 21” L x 18” W x 15” H
  • Skimmer Chamber: 11.5” x 13”
  • Return Chamber: 5” x 17”
  • Approximate Water Volume: 22 gallons
  • Skimmer Chamber Water Level: Adjustable from 7” – 9” with Level-O-Matic

We suggest choosing the largest sump that you can fit in the space allowed.


The features of the Skimz Sumpro series have been designed with the advanced reefer in mind, many of which you will normally only find on expensive, high end sumps. All Skimz sumps include integrated probe holders, filter socks, tube holders and an adjustable skimmer chamber. With a super clear front acrylic window allowing you see your equipment without any distortion and all other sides are white to keep things bright and super sharp looking.


DuoFlo Sock Chamber

With the importance of crystal clear water every Skimz sump comes with a DuoFlo tiered filter sock system. The system incorporates two filter socks of different lengths in a series allowing for fewer changes of both filter socks, and the ability to install a progressive micron system of filter socks.



Allows quick and steady adjustments of the water height in the skimmer chamber by controlling an adjustable baffle.  There are no thumb screws to mess around with like many of the competitors and your hands will stay dry when adjusting the baffle allowing your choice of skimmer to perform at its prime level.


Probe Holders

Each Skimz Sumpro Sump comes with 4 integrated probe holders that will accompany any type of probe up to ½” diameter.


Dosing Tubes

Dosing tubes can always be a source of clutter and headache to keep looking clean and not a tangled mess. Every Skimz Sumpro sump comes with 4 dosing tubes letting you dose anything you want from trace element solutions, calcium reactor effluent, nitrate reactors, or anything else that uses standard 3/16” tubing.


What’s In the Box:
1x Sumpro UP21
1x Sock Cover
1x Level-O-Matic Control Knob and Nut
1x Spillway Gate
1x Spillway Sponge
1x Chiller Hose Cover
1x Heater Cover plate
1x El-S300 Filter Sock
1x EL-L300 Filter Sock
4x Silicone Dosing Tube
4x Dosing Tube Hose Barbs and Nuts
1x Switchable PVC Pipe Cover
4x Switchable Cover Thumbscrews
4x Probe Holder Thumbscrews

Skimz Sump Comparison Chart

Model Approx water volume Skimmer Chamber Skimmer Chamber Water Height Refugium Chamber Return Chamber Built in Top-off reservoir Overall Dimensions
UP14 15 Gal 8" x 13" Adjustable 7" - 9" N/A 5" x 17" N/A 14" L x 18" W x 15" H
UP18 19.5 Gal 12" x 13" Adjustable 7" - 9" N/A 5" x 17" N/A 18" L x 18" W x 15" H
UP21 22 Gal 11.5" x 13" Adjustable 7" - 9" N/A 5" x 17" 3.2 Gal 21" L x 18" W x 15" H
UP22 15.7 Gal 11.5" x 11" Adjustable 7" - 9" N/A 5" x 12" N/A 22" L x 12" W x 15" H
UP30 26.9 Gal 14" x 14" Adjustable 7" - 9" N/A 8" x 14" 2.0 Gal 30" L x 15" W x 15" H
UP34 30.4 Gal 13" x 14" Adjustable 7" - 9" 5" x 14" 8" x 14" 2.4 Gal 34" L x 15" W x 15" H
UP36 32.3 Gal 13" x 14" Adjustable 7" - 9" 6" x 14" 8" x 14" 2.7 Gal 36" L x 15" W x 15" H
UP39 34.9 Gal 14" x 14" Adjustable 7" - 9" 8" x 14" 8" x 14" 3.0 Gal 39" L x 15" W x 15" H
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Product Questions

The drain pipe that then flows into the filter socks, what pipe diameter is it? Can it be removed for a larger/smaller pipe installation? Is it rigid pipe or flex? And how can I attach it to pic plumbing?
Question by: Joseph Cosmai on Jun 8, 2017, 11:41 AM
The drain pipe attachment comes with a 1' pvc connection. Unfortunately this is not designed to be replaced, though of course the DIYer with a will can usually find a way. With that said, given the size of the sump, this drain size will be appropriate for almost any properly matched aquarium, and if you wish to downsize for smaller plumbing (not frequently recommended to go smaller than 1" on drains), you could always use a reducing bushing at the point of connection to the drain.

Happy reefing!
Answer by: Zack on Jun 13, 2017, 9:50 PM
Do you sell the 200 micron mesh socks to fit this sump. All I can find are the 300?
Question by: Joshua Graham on Jan 12, 2017, 10:59 AM
Great question! Any of our BRS Mesh Filter socks will fit this sump. In which case, they are 200 micron! :-)
Answer by: Randy on Jan 12, 2017, 2:47 PM