Trigger SystemsSKU: EMERALD20C



The Emerald series introduces several new features not found anywhere else. Some of the features of the EMERALD20C are:

  • Interchangeable plates (Patent Pending)

  • Laser etched lid to prevent splashing and reduce noise

  • Adjustable water level

  • Laser engraved water level indicator

  • Three position probe holder

  • 0.25″ hose holder for dosing and ATO inputs

  • Protein skimmer section

  • Refugium section

  • Emerald green coloring to block light and prevent unwanted algae growth in other sections


The EMERALD20C has 4 main sections. Water enters the sump into a dedicated section where the water will then flow over into Section 1. Section 1 is the configurable interchangeable plate area allowing for filter sock and/or foam block mechanical filtration. This area is covered with a lid to prevent water splashing and reduce noise. Water then flows out the bottom of Section 1 into Section 2.

Section 2 is typically where the protein skimmer is located. Water then flows through the ‘Trigger Symbol’ cutout into Section 3.

Section 3 is the refugium section. The water then flows over the adjustable water level baffle through a platform that contains a foam filter block and then under the last baffle into Section 3.

Section 4 is the return section where the return pump will sit, pumping water back to the display tank.


1. Interchangeable plates

2. Lid to prevent splashing and reduce noise

3. 0.25″ hose inputs for dosing and ATO

4. Laser engraved water level indicator

5. Adjustable water level

6. Three position probe holder

7. Full top support brace to prevent bowing


The EMERALD20C comes with the following accessories for Section 1:

  • Filter Sock Plate

  • 4″ Filter Sock (100 micron rating)

  • Foam Block Distribution Plate

  • Filter Foam Block

The Filter Sock Plate can be installed with filter socks as shown. EMERALD20C has a single 4″ sock, EMERALD34 model shown in the images.

The Foam Block Distribution Plate is perforated with holes and can be used when filter socks are not desired or in the case when the filter socks need to be changed or cleaned but replacement socks are not readily available and you want to maintain some level of mechanical filtration. In this case, simply remove the filter socks and install the Foam Block Distribution Plate with the foam block.

The Foam Block Distribution Plate may also be used on top of the Filter Sock Plate with filter socks. This configuration helps to distribute the water more evenly across all socks so that the filter socks will last longer before clogging and will clog at the same time. This also helps to silence the water noise by slowing down and spreading the water more evenly across the surface area of all of the socks. In this configuration, the foam block filter can be placed on top to enhance even further the silencing and distribution of water and also allow even longer times before the socks become clogged by providing a pre-filter before the socks. This configuration is shown in the image and is the default configuration.



The EMERALD20C comes with a probe holder that can hold up to three probes. The two outside holes are 0.63” in diameter and the center hole is 0.8” in diameter to fit different sized probes.


Water level in the sump is adjustable from 7” to 9.5” to accommodate for the water height requirements for different protein skimmers. Simply move the baffle to the desired height location and tighten the two bolts to hold in place.

As the water level is adjusted by sliding the wall up and down, the foam block filter and the top perforated platform also move up and down automatically. This is important to maintain the correct location of the foam block sponge filter with respect to the sump water height and also to maximize the media capacity for the bottom platform.


Subtle water level height indicator is laser engraved on the inside wall to help when setting the adjustable water level to to the desired water height based on protein skimmer requirements.


All Emerald sumps also come with 4 holes in the top support brace for holding in place 1/4” OD tubing from reactors, dosing containers or ATOs.


The laser etched lid over the interchangeable plate section allows for easy access to the filter socks and foam filter while providing suppressed noise and splashing.
Emerald 20C
Dimensions: 20″ long x 20″ wide x 15″ high
Skimmer Section: 11.625″ x 9″
Refugium Section: 19.5″ x 6″
Return Pump Section: 10.25″ x 7.625″
Total Water Volume: 24.3 gallons
Skimmer Water Level: 7″ to 9.5″ adjustable
Drain Input Fittings: 1″ (x1)
Filter Socks: 4″ (x1)

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