CL-72 Filter Sock Sump


CL-72 Filter Sock Sump 72″ x 18″ x 18″ These sumps are built to order and current build time is 6 weeks.

    Reset options

    Choose your exterior side colors

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

    Choose how many Drains you need.

    *John Guest Fittings

    Please select how many John Guest fittings you would like installed.

    • 10 Gallon ATO Containers (44-60-72 Series)

      $239.99 $161.99$206.99

      18" x 8" x  18"  10 Gallon ATO for our TS-44 and CL-44 Series Sumps.

      BUILT TO ORDER ITEM - Current lead time is 1-3 weeks

      • Exterior Wall Color*
      SKU: 10GallonATO18

SKU: CL-72 Category:


Looking for a larger sump designed for reefers, by reefers? The Synergy Reef® CL72 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 the highest quality materials. No details are left unfinished.

Since this sump has a Refugium built in, you get the added benefit of the Refugium removing nitrates for you. So 2 mechanical filtration sections (Socks & Skimmer) and a Refugium.  We recommend this sump for tanks up to 300 Gallons.

These are available in left to right flow or right to left flow. Please select the option.



  • Standard – Clear Sides and Back ***** If you would like the sides and back the to be matching Color , 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: 72″ long x 18″ wide x 18″ high
  • Filter socks fit 2 x 7″ Standard Filter socks
  • Refugium Section: 19″ x 17.5″ (Approximately 20 Gallons)
  • Skimmer Section: 27.5″ x 17.5″
  • Return Pump Section: 8.75″ x 17.5″
  • Total Water Volume: 95 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 Socks, Refugium and Return Pump area
  • 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 Synergy Reef Shadow® Overflow systems)
  • Return Area has a 1″ bulkhead for easy return pump hookups. (optional 1.25″ or 1.5″)
  • Optional 4, 5 or 6 x 1/4″ John Guest tubing holders for plug n play dosing / ATO connection
  • Optional addition of 2 more 1.5″ Bulkheads to the drain section for connection of up to 5 x 1.5″ Drain Lines
  • Optional 3 x 1/2″ bulkheads in the skimmer section for adding additional equipment returns
  • Optional 10 Gallon Matching ATO can be found Here: 10 Gallon CL ATO

MSRP: $1474.99 -$1524.99
We ship these via LTL Freight due to Large size of these sumps. Freight cost is shipped to your home or business. You can calculate freight costs on checkout.


Additional information

Weight120 lbs
Dimensions75 × 22 × 26 in

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Exterior Wall Color


4 Port Probe Holder


Heater Holders

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Sock Silencer (set)

No, Yes, I do want matching sock silencers

Add 2 x 1.5" Drains


Return Bulkhead Size

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Stainless Thumbscrews

No, Plastic is fine., Yes, Adjustable Baffle and Passive Baffle (Qty.4)



Customer Reviews

Based on 2 reviews
CL-72 Review

Very satisfied with the tank. Everything arrived at the shipping HUB and there were no issues during pick up. The only thing I wish they would change is the ability to speak to a human with questions and details of the build. They were quick to reply and answer any questions via email but I personally like speaking to a person about something like this especially when dealing with an item of this price tag.

Awesome sump!

If you are in the market for a custom sump, I highly recommend them. They are very professional and are very responsive with any questions that you have during the build process. Also, when you receive your sump, you will be impressed on the packaging care they take.. Tom

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