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 Category:


The synergy Reef Series ATO Containers fit in line perfect with our CL-26, TS-26, TS-34 and CL-34 series sumps. We have designed this model to be plug and play with these sumps. They can also be used with any existing reef tank setup. The Synergy Reef ATO is built of the highest quality materials available. Our attention to detail is second to none. These are universal and will work with any ATO controller on the market.


When choosing your Exterior Color, there is an option for either All Clear or Color to Match sides and back. This is an example of the difference:

Clear Sides and Back

Color to Match Sides and Back


  • 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: 15″ long x 6″ wide x 15″ high
  • Approx. 5 Gallon Storage Capacity
  • 1/4″ John Guest tubing holders for plug n play ATO connection.
  • 1.5″ Rear hole allows for power cord to be run outside the container if an internal pump is used.
  • Will work with all ATO control units
  • 4.5″ Fill hole for easy filling
  • Easy removable lid to prevent evaporation.
  • Laser Etched graduated Gallon or Liter markings on the front panel for easy measuring of water. Choose Option for Gallon or Liter.
  • Built in the USA!

MSRP: $164.99 – $174.99


Additional information

Weight13 lbs
Dimensions13 × 21 × 21 in

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Exterior Wall Color


Customer Reviews

Based on 10 reviews
javier mercado
Ato 5 gallon container

Perfect love the change of color to the unit thanks

Michael Soriero

These guys built the best sump I have ever seen

Christopher Young
Love the quality

I have both the sump and ATO that matches. Love both of these.


I’m very happy with the ATO

Denise Porter
Amazing ATO and customer service!

This is the second order I've placed from Synergy and they continue to be fantastic. I got almost instant help with my custom request which they accommodated at no additional charge. I had great communication with them and when they had a question, rather than just making a choice, they reached out for my feedback. When the container arrived, it looked even better than I imagined it would. Very professional and looks great with my system which is important because the ATO is visible by design. Looking forward to a bigger system and more products from Synergy!!! Best, D. Porter