Synergy Reef CL-34 Sumps


This sump is built to order with a current lead time of 2-3 weeks. Materials are “In Stock” for this build

34″ x 15″ x 15″ Synergy Reef CL-34 Sump Color Laminated

    Reset options

    Choose your exterior side colors

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

    *Choose what Drains you need.

    Optional Accessories

    John Guest Fittings

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

    *Filter Socks

    4" Filter Socks 100 Micron

  • Sock Silencer (set)*

    • 5 Gallon ATO Containers



      BUILT TO ORDER ITEM- Current lead time is 1-3 weeks (materials are "IN STOCK" for these builds)
      15" x 6" x  15" ATO

      5 Gallon ATO Containers

      • Exterior Wall Color*
      SKU: 5GallonATO

    • 16" Shadow Overflow V3


      New Shadow V3 Overflow Kit

      In stock (can be backordered)

      SKU: Shadow16V3
SKU: CL34Sump Category:


Are you looking for the perfect sump that not only looks awesome, but has over the top performance? The Synergy Reef® CL-34 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. We hand build each one to meet your needs. Need slight modifications in length to be able to fit this in your stand. Want it to flow right to left or left to right? We can do that! Try that with an off the shelf sump. The CL Series™ sumps feature a double color Cross Laminated™ euro brace. Check out these specs and dare to compare to our competitors! We only use the highest quality cell cast acrylics on our sumps. Built by Reefers for Reefers!

Available in Left to Right or Right to Left Flow Configurations (Shown in Left to Right)


  • 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 Smoked front. 
  • Dimensions: 34″ long x 15″ wide x 15″ high
  • Skimmer Section: 17.5″ x 14.5″
  • Return Pump Section: 6″ x 14.5″
  • Total Water Volume: 31 gallons
  • Skimmer Water Level: 6″ to 10″ adjustable
  • Removable 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 6.5″ to 9.5″
  • Cross Laminated™ color Euro-bracing
  • High Quality Precision Machined Poly carbonate lids over Filter Socks and Return Pump areas
  • High Quality machine rounded and chamfered edges
  • Advanced designed Euro-bracing also has cord routing and Dosing connections built in
  • 4 x 1/4″ John Guest tubing holders for plug n play dosing / ATO connection
  • Drain Input Fittings: 3 x 1.5″ ABS Bulkheads (Allows Plug n Play with the (Shadow Overflow System)
  • Filter Socks Holders: 2 x 4″
  • Return section has 1″ Bulkhead
  • Made In The USA!!

MSRP: $699.99

**********These sumps are built to order.  Current lead time is 2-3 weeks  ******************


Additional information

Weight45 lbs
Dimensions41 × 21 × 21 in
Stainless Thumbscrews

No, Plastic is fine., Yes, Adjustable Baffle Only (Qty.2)

Heater Holders


Exterior Wall Color


Return Bulkhead Size

, ,

Sock Silencer (set)

No, Yes, I do want matching sock silencers

Customer Reviews

Based on 4 reviews
Tyler Sortino
Amazing quality!

All I have to say is WOW! Perfect for my 100g build. Amazing quality and amazing customer service. The sump is amazing and the attention to details is spot on. By far the best sump I’ve purchased. Will be a returning customer when another is needed

Tom Sharpe
Top notch

Reefing is a hobby of gear and if you’re like me you want your gear to look as good as your tank and you want to show it off.
You will not be disappointed!

Lord Imson
The best component of my new 100g build

TLDR: Awesome customer service and fantastic product!

I spent weeks researching sumps for my new 100g build, and especially hesitant to purchase a sump that is not off the shelf because of previous experiences with other companies. But from the moment I contacted Synergy Reef to inquire before purchasing, I knew I was in good hands. Their customer service is probably the best I have ever experienced. They are quick to respond with any questions (even my dumb ones) and it felt very personal, not just another 'customer'. The online purchase was very straight forward and intuitive, and the build status update was great, especially for people like me who are very impatient with online purchases. .. And the SUMP.. I cannot be happier with the build, quality, design, look, aesthetics, component placement, you name it. I find myself looking at the sump more than my display tank. I have absolutely zero regrets with working with Synergy Reef and will absolutely work with them in the future. Honestly, don't look further- they have the best product, cost, turnaround time, and customer service ratio.

Matthew Gauvin

I was a little hesitant making such a significant investment not thru a major retailer. However liked what I saw so jumped in. From initial online order and custom additional request, every aspect thus far has exceeded my expectations (I.e. the title). Communication thru the entire build process, as these are built to order, was great! It was completed and shipped ahead of original estimates. When it arrived I was truly impressed with the care in “over packing” the sump. That would have been they way I would have done it myself so there you go! Hefty box, additional edge protection inside surrounded in copious amounts of packing material and then even further down every piece carefully secured and whole unit shrink wrapped. Then the unit itself! WOW!! What a piece of art. This will eventually be part of my display so I wanted visual quality and I got it! It will take a while to get it in the system as I have some major plumbing to do and of course it is an already operating reef tank. Once done will come back and review the unit in operation, but I have 0 concerns. Just looking at the craftsmanship there is no skimping anywhere!

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