Octo Classic 100HOB Collection Cup
SKU: ROP-CC-BH100
- Genuine OEM Direct Replacement: Authentic factory-spec waste collection reservoir designed specifically for the Reef Octopus Classic 100HOB (BH-100) hang-on back protein skimmer series.
- Premium Cell-Cast Acrylic Construction: Fabricated from optically clear, high-grade cell-cast acrylic that resists discoloration, crazing, and structural warping over time.
- Optimized Fractionating Neck Cylinder: Engineered with original factory tolerances to ensure proper surface area contact as foam transitions into organic waste fluid.
- Integrated O-Ring Contact Deck: Features a smooth, precision-machined lower neck profile that seats seamlessly into the skimmer's native friction-lock compression ring.
- Effortless Slide-Depth Calibration: Built to allow smooth vertical height adjustments, letting you dial in wet or dry skim preferences easily.
- Hassle-Free Maintenance Tear-Down: Designed for immediate slip-out extraction, making your routine collection washouts quick and straightforward.
Reef Octopus
Globally trusted for premium protein skimmers and pumps, engineered in-house for unmatched reef filtration performance.
Reef Octopus Classic 100HOB Replacement Collection Cup (ROP-CC-BH100)
The Reef Octopus Classic 100HOB Collection Cup (SKU: ROP-CC-BH100) is an authentic factory-spec replacement wastewater reservoir distributed by CoralVue to preserve the active nutrient export capabilities of your hang-on back filtration loop. On an external protein skimmer like the Classic 100HOB, the collection cup serves as the final destination for concentrated organic waste, protein sludges, and dissolved biological matter lifted out of the water column. Because the skimmer operates on a continuous friction-fit slide neck, the cup must be manually raised or lowered to adjust the foam line.
Over years of heavy service, the constant cleaning, accidental drops in utility sinks, or harsh scrubbing can chip the delicate bottom neck or crack the main body joints, creating an external leak risk. Replacing your compromised or cloudy chamber with this genuine OEM part guarantees a tight fitment against your skimmer frame. This tight connection keeps the active microbubbles building a steady, pressurized foam column rather than escaping through a broken seam, preventing accidental overflows onto your flooring.
Key Features
True Factory Sizing Tolerances: Precision-machined to match the unique neck diameter of the Classic 100HOB external skimmer frame.
Flawless Molecular Surface Finish: Features highly polished internal walls that prevent premature organic sludge buildup, ensuring smooth waste travel.
Reef-Safe Chemical Stability: Built out of stable, non-leaching marine plastics that stand up to active ozone exposure and hot cleaning rinses.
(Note: This replacement assembly consists of the clear acrylic collection cup body only. The matching lid and neck sealing O-ring are sold separately).
Verified Hardware Compatibility
Reef Octopus Classic HOB Series: Sized explicitly for the Classic 100HOB (alternatively labeled as the BH-100) hang-on back external skimmer.
Variant Family Fitments: Fits specialized variant configurations including the BH-100F and BH-100T multi-filter skimmer models.
(Note: This collection cup is configured exclusively for the specific neck infrastructure of the 100HOB footprint. Larger skimmer frames, such as the Classic 1000HOB or 2000HOB, utilize wider dimensions and require different replacement SKUs).
(1) Reef Octopus Replacement Classic 100HOB Clear Acrylic Collection Cup Body
(Note: Collection cup lids, flexible waste drain lines, neck alignment O-rings, and molded skimmer bodies are sold separately).
Technical Specs:
Official Manufacturing Title: Reef Octopus Classic HOB Collection Cup (100HOB Variant)
SKU / Factory Part Identifier: ROP-CC-BH100
Material Composition: 100% High-Clarity Marine-Grade Cell-Cast Acrylic
Connection Profile: Direct Slide-In Friction Neck Fitment
Primary Function: Organic Waste Fractionating Containment Reservoir
Lid not included.
- Turn off your protein skimmer's Aquatrance pump to stop the active foam column from rising before removing any components.
- Carefully loosen the nylon holding screw on your skimmer's neck ring and slide the old collection cup straight up and out.
- Remove your existing collection cup lid and set it aside; slide the black rubber neck O-ring off the old cup neck if it is still usable.
- Clean the inside of your skimmer's main neck port with a soft towel to clear away any built-up organic sludge or hard salt scale.
- Slide your rubber neck O-ring onto the lower neck of the new ROP-CC-BH100 collection cup, and seat the cup back down into the skimmer body.
- Position the cup at your desired depth line, hand-tighten the nylon bracket screw gently, place your lid on top, and restart your pump.
Pro Tips:
- Never Use Harsh Chemical Solvents or Alcohol to Clean Acrylic. When washing out your new collection cup, never use rubbing alcohol, glass cleaners, or harsh chemical sprays like Windex. Alcohol and chemical solvents will trigger a structural chemical reaction known as "crazing" in cast acrylic, which instantly creates thousands of tiny hairline micro-fractures through the plastic. This permanently clouds the view and destroys the structural integrity of the cup. Wash the unit using only warm tap water and a soft microfiber cloth or sponge.
- Use Citric Acid Baths for Stubborn Calcium Scale. Over several months of continuous operation, hard white rings of calcium carbonate and coralline algae can bake onto the clear acrylic walls of the cup. Do not use metal razor blades or coarse green abrasive pads to scrape them off, as you will permanently gouge the smooth interior paths. Instead, soak the collection cup in a warm bath of water mixed with citric acid powder for 30 minutes. The scale will dissolve entirely, allowing you to wipe it clean without scratches.
- Lubricate the Neck O-Ring for Smooth Tuning. If you find it difficult to slide the collection cup up and down when fine-tuning your skimmer's performance, do not force or yank the assembly. Forcing the clear acrylic cup against a dry rubber ring can split the mounting bracket collar on the main skimmer frame. Pull the cup out and rub a microscopic smear of 100% pure silicone grease or even a drop of water directly onto the black rubber O-ring. This lets the cup glide smoothly for effortless depth calibrations.