Synergy Reef CL-44.4 (4″ Sock Version) Sump


44″ x 18″ x  18″ Reef Sump accommodate 4″ Filter Socks (sold separately).  These sumps are built to order and current lead time is approx. 6-8 weeks. All Grey Based sumps are currently on Back Order Until July 2024

  • *Color

    *Flow Configuration

    Reset options

    Choose your exterior side colors

    *For Storm Cloud color, please select "All Clear" 

    *John Guest Fittings

    Please select how many John Guest fittings you would like installed

SKU: CL44-4 Category:


Are you looking for the perfect sump that not only looks awesome, but has over the top performance and will last for years? The Synergy Reef® CL-44 model sumps are your answer. We have designed this model to meet the demands of the reefer who demands more than the average off the shelf sump for large systems. These sumps are ready out of the box to meet those needs! These are hand-built right here in the USA with only the highest quality materials and craftsmanship. Make sure you check other sump manufactures’ 44″ sump dimensions as they are not the same as ours. Our 44″ models are designed to provide the best functionality on your system. The larger width and height set us apart from the smaller 44’s on others websites.

Refugium wall is optional and placed 10″ from the sock wall. Please select the refugium option from the options when ordering. Refugium does have a separate Poly carbonate lid over it with passive baffle system. This photo below is a CL44.4 with the Refugium Option installed.


  • Standard – Clear sides and back. ***** If you would like the sides and back the to match , please select “Color to Match” in the Exterior Wall Color Option above.  For storm cloud choose “ALL CLEAR”.  Storm Cloud will have White sides/back with a Clear Smoke front. 
  • Dimensions: 44″ long x 18″ wide x 18″ high
  • Skimmer Section: 27.5″ x 17.5″ (without Optional Refugium)
  • Skimmer Section: 17″ x 17.5″ (with Optional Refugium)
  • Return Pump Section: 6″ x 17.5″
  • Total Water Volume: 58 gallons
  • Skimmer Water Level: 6″ to 10″ adjustable
  • Removable Laser cut media tray in between the baffles use for filter pads and bags of media
  • Laser etched water level markings to allow easy setup of skimmer water depth from 6″ to 9.5″
  • High Quality Precision Machined Poly carbonate lids over Filter Socks, Optional Refugium and Return Pump areas
  • High Quality machine rounded and chamfered edges
  • Advanced designed Euro-bracing also has cord routing and Dosing connections built in
  • Drain Input Fittings: 3 x 1.5″ ABS Bulkheads (Allows Plug n Play with the Shadow Overflow® systems)
  • Filter Socks Holders: Fits 2 – 4″ x 12″
  • 3 holes in center euro-brace to accommodate optional 1/2″ Bulkheads for easy hookup to manifold returns or reactors.
  • Return Area has a 1″ bulkhead and optional 3/4″ Bulkhead for easy return pump hookups.
  • Optional 4, 5 or 6 x 1/4″ John Guest tubing holders for plug n play dosing / ATO connection
  • Optional 10 Gallon Matching ATO can be found Here: 10 Gallon CL ATO

MSRP: $799.99

We ship these via LTL Freight on a pallet or Via UPS Ground at our discretion. Flat Rate Shipping in some areas in the Lower 48 CONUS


Additional information

Weight95 lbs
Dimensions49 × 25 × 25 in


4" Filter Socks 100 Micron

, ,

Sock Silencer (set)

No, Yes, I do want matching sock silencers

Customer Reviews

Based on 12 reviews
These sumps are a work of art.

Just got my 4th sumps from Synergy and like the previous ones, this one is perfect. Each detail is well thought out and the execution is flawless, zero regrets.

Eric Belsinger
Project at the VA

Thanks for producing a great product on a helpful timeline - this system will be enjoyed by veterans of our country for decades potentially.

Joshua Azevedo
Awesome craftsmanship. Great sump.

I originally ordered an Innovative Marine Nuvo 200 EXT with an RFS50 sump. Innovative Marine messed up my order and forgot my sump, so I went with Synergy instead...and I'm really, really glad I did.

The sump is gorgeous. Build quality is phenomenal. This is my first 'nice' sump and there's tons of little QOL improvements that I'd never considered, but are well worth it (such as the adjustable water level).

I'd also like to give a shoutout to Synergy for getting my sump to me extremely quickly after I told them about my situation. While this will probably be my last build for quite some time, they've earned a customer for life.


Fantastic workmanship, and wonderful communication throughout the build process. I’ve been a reefer for over two decades, and I’d say this is in the top five of my most satisfying purchases for this hobby. I did a lot of research before ordering from Synergy, and I’m so glad I did. Highly recommended!

Oh, and never in my life have I seen a more careful and thoughtful approach to packaging for freight. When it arrived, any worries I might of had about damage during shipping disappeared. Quality through and through.

Thank you Rebecca for the feedback! We take pride not only in the products we build, but also in our customers. Being a small family business, this allows us to focus on you! Also we believe that packing and shipping are just as important these days as the product itself. We do charge for shipping, but we do not take it from the quality of your sump like others that 'give' FREE Shipping'. Nothing is FREE. We appreciate your support!

Cynthia Robertson

These are truly professional craftspersons! The sump was delivered on time, expertly packaged and functionally beautiful in every way! They know their business and fulfill all expectations. THANKS!

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