Octo Reef Sump 15
SKU: OCT-OS15A
MSRP: $ 375.36
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Available Through Authorized Retailer
- Compact Footprint Configuration: Engineered with a specialized 15x15 inch square layout, making it the perfect mechanical filtration upgrade for space-restricted nano and mid-sized reef displays.
- Adjustable Water Level Height: Built-in sliding gate baffle easily adjusts the internal skimmer chamber depth from 5.1 to 9 inches, optimizing performance without a plastic riser stand.
- Integrated Fresh Water Reservoir: Features an on-board 1.5-gallon freshwater ATO compartment with an independent acrylic cover lid to minimize daily evaporation.
- Roller Filter Mat Utility: Includes a standard 4-inch filter sock holder structurally calibrated to accept direct drop-in automatic fleece rollers like the Klir Di-4.
- Bubble Diffusing Interceptor: Outfitted with an intake baffle shield and dedicated splash cover lid that traps rushing air to eliminate micro-bubbles and salt creep.
- Signature Aesthetic Accents: Hand-fused with optical-grade heavy sheet acrylic and finished with signature Reef Octopus red color schemes matching VarioS and Classic equipment.
Reef Octopus
Globally trusted for premium protein skimmers and pumps, engineered in-house for unmatched reef filtration performance.
Reef Octopus OCTO OS-15A Premium Acrylic Reef Sump
The Reef Octopus OCTO Sump 15 (Model No: OS-15A) is a premium, high-density acrylic filtration basin meticulously designed to bring elite organizational architecture and mechanical efficiency to space-conscious marine reef aquariums. Many small cube setups and nano reef tanks struggle with limited under-cabinet areas, leaving owners to piece together basic plastic storage tubs or custom glass tanks that leak or fail to regulate water depths. The OS-15A bridges this divide, providing a compact 15x15 inch command center crafted from solid machine-cut sheet acrylic that unifies your mechanical, biological, and chemical filtration processes.
Despite its space-conscious footprint, the OS-15A is packed with features designed by hobbyists, for hobbyists. Raw drain water entering the sump routes straight into a specialized bubble-diffusing intake chamber. This compartment features a form-fitting acrylic cover plate that dampens acoustic water noise, stops micro-bubbles from migrating into the display, and controls corrosive under-cabinet salt creep. For mechanical filtration, a built-in 4-inch filter sock seat holds standard media socks for heavy debris capture. Recognizing the trend toward automation, the structural dividers are cut out to accept the Klir Drop-In Automatic 4-Inch Fleece Filter. This gives you the option to bypass manual sock washings entirely for months of hands-free operation.
The center of the sump houses a spacious, dedicated protein skimmer and reactor bay governed by an adjustable weir overflow gate. By loosening two thumbscrews, you can shift the operational water column from 5.1 up to 9 inches deep. This allows you to lock in the exact operational immersion height required by your skimmer's venturi throat, ensuring optimal foam generation without needing to purchase an aftermarket riser shelf. Flanked by an isolated return pump compartment and a built-in 1.5-gallon freshwater top-off reservoir, this robust, hand-fused workhorse serves as a sleek and functional foundation for high-end nano reef systems.
Key Features
Industrial Structural Assembly: Heavy cast acrylic sheets are welded together by hand with seamless solvent joints to avoid warping, structural bowing, or hairline leaks.
Dynamic Skimmer Calibration: Eliminates fixed-baffle restrictions by giving you immediate manual control over the skimmer compartment's working water level.
Integrated ATO Storage: Includes a dedicated 1.5-gallon reservoir with an evaporation lid to keep your automatic top-off supply clean and nearby.
Anti-Siphon Isolation: The return pump chamber sits safely partitioned away from shifting water levels, ensuring stable automated freshwater replenishment.
Polished Finishing Bevels: All exposed edges feature precision machined profiles to prevent finger pinches or wire abrasions during regular equipment scrub-downs.
Equipment Recommendations
Compatible Protein Skimmers: Reef Octopus eSsence S-130, Classic 110SSS, Classic 110-S
Compatible Return Circulation Pumps: Reef Octopus Aquatrance 2000, VarioS 2
Compatible Automatic Mechanical Filters: Klir Fleece Filter Mat Di-4
For aquariums ranging from 10-80 Gallons
What’s Included:
(1) Reef Octopus OCTO OS-15A Acrylic Sump Base Unit
(1) Adjustable Skimmer Weir Gate with Nylon Thumbscrews
(1) Bubble Diffuser Compartment Acrylic Splash Lid
(1) Freshwater ATO Reservoir Acrylic Dust Lid
(1) 4-Inch High-Density Mechanical Filter Sock
(1) 1-Inch Slip Input Plumbing Bulkhead Union Fitting
Technical Specs:
Official Model / SKU: OCTO Sump OS-15A / OCT-OS15A
Global Boundary Dimensions: 14.96 in L x 14.96 in W x 13.78 in H
Dedicated Skimmer Bay Area: 9.45 in x 9.45 in
Dedicated Return Pump Area: 4.5 in x 6.5 in
Freshwater Top-Off Volumetric Capacity: 1.5 Gallons (6 Liters)
Adjustable Water Level Range: 5.1 in – 9.0 in
Incoming Plumbing Interface: 1 in Bulkhead (32mm)
Integrated Filter Sock Capacity: (1) 4 in Ring Port
Suitable Return Pump: AQ-2000
Suitable Protein Skimmer: Classic 110S, eSsence 130
Warranty
CoralVue, Inc. hereby guarantees this product to be free from defects in material and workmanship for a period of:
- 1 Year
Warranty is activated on the date of purchase.
This Standard Limited Warranty applies and is limited as follows:
- To the product only as long as it remains in the possession of the original purchaser.
- To the product that has not been subject to accident, misuse or abuse.
- To the product that has not been modified, altered, defaced, or had repairs made or attempted by other than CoralVue, Inc.
- That CoralVue be immediately notified in writing within ten (10) days of first knowledge of defect by owner or his agent.
- That CoralVue, Inc. shall be given first opportunity to make any repairs, replacements or corrections to the defective construction within a reasonable period of time.
- Under no circumstances shall CoralVue and/or the Manufacturer be liable by virtue of this warranty or otherwise for damage to any person or property whatsoever for any special, indirect, secondary or consequential damages of any nature however arising out of the use or inability to use because of the product defect.
- Carefully slide the empty OCTO OS-15A sump into your dry equipment cabinet, checking that you have clear overhead space to lift the skimmer cup and ATO lids.
- Align your main display tank's primary drain line pipe directly down into the 1-inch slip bulkhead union located at the rear bubble diffuser compartment.
- Loosen the dual nylon thumbscrews on the adjustable baffle wall and set the sliding weir panel to match your protein skimmer's recommended depth setting.
- Position your chosen protein skimmer inside the main 9.45-inch chamber and place your return pump into the designated isolated return corner.
- Plumb your return pump up to your display return line, fill the sump with saltwater until it spills over the baffle, and plug in your circulation network.
- Fill the secondary isolated freshwater reservoir with pure RO/DI water, drop in your ATO pump line, and secure the matching acrylic dust lid.
Pro Tips:
- Set the Skimmer Gate First. Before plugging in your protein skimmer, look up its manufacturer-specified optimal running depth. Loosen the sump's weir thumbscrews and line up the top of the sliding gate with that exact height mark on a ruler before locking it back down. Setting this baffle height before you fire up your equipment prevents your skimmer from instantly overflowing or dry-stalling during its initial startup loop.
- Keep the Diffuser Lid on Tight. Make it a habit to leave the acrylic cover plate sitting flush over the rear drain compartment during normal operation. Rushing drain water crashing into a sump releases a continuous spray of microscopic saltwater droplets. If left uncovered, this spray escapes into your cabinet, creating heavy salt creep that can corrode metal hinges, coat wires, and ruin surrounding electrical gear.
- Transition to Automatic Mechanical Rollers. If you find yourself putting off cleaning or replacing your 4-inch filter sock every few days, consider upgrading the mechanical section with a Klir Di-4 Fleece Filter. The OS-15A was designed from the ground up to receive this specific drop-in roller unit. It fits directly into the factory sock opening and hooks up to a localized controller to automatically advance clean fleece whenever the water level rises, giving you true automated filtration.