Octo BH100 Square Pipe Sponge
SKU: ROP-HOB100-SS
- 100% Genuine OEM Factory Part: Crafted directly by Reef Octopus as a precise physical drop-in match to swap out hardened, brittle, or clogged output foam pads.
- Hydrodynamically Tuned Porosity: Coarse open-cell foam structures slice and collapse exiting micro-bubbles without backing up internal skimmer water levels.
- Precise Square Geometry: Custom-punched from the factory with a central square core alignment tracking channel to slide cleanly onto the HOB discharge assembly.
- Explicit Classic 100-HOB Match: Form-fitted explicitly to handle the physical layout configurations of BH100 and Classic 100-HOB external chassis styles.
- Saltwater-Safe Formulation: Forged from an inert, non-bleaching polymer blend that will not disintegrate or cause erratic skimmer cup overflows.
Reef Octopus
Globally trusted for premium protein skimmers and pumps, engineered in-house for unmatched reef filtration performance.
Reef Octopus BH100 Replacement Square Pipe Sponge (SKU: ROP-HOB100-SS)
The Reef Octopus BH100 Replacement Square Pipe Sponge (SKU: ROP-HOB100-SS) is an authentic, structural OEM mechanical diffuse component distributed by CoralVue to preserve crystalline water clarity inside home reef aquariums. Hang-on-back protein skimmers utilize high-velocity needlewheel pumps to aggressively inject air into water. While this process is exceptional for binding dissolved organic waste compounds, it naturally charges the exiting water column with an immense volume of micro-bubbles. If these bubbles escape back into your main display tank unchecked, they create unsightly visual "salt storm" distortion and can agitate sensitive coral polyps. This custom square foam sleeve provides the critical mechanical block needed to pop escaping air bubbles before they bypass your return track.
Molded from high-grade, marine-inert polymer foam, the ROP-HOB100-SS features an optimized, loose-pore matrix. This specific calibration holds back micro-bubbles and fine surface film while letting clean water slide through freely. The core center channel is machine-punched into a clean square cross-section tailored explicitly to wrap around the standard square return pipes of the Reef Octopus Classic 100 Hang-on-Back (CLSC-100HOB / BH100) skimmer lines. Replacing your old, clogged, or structural collapsing output foam restores clean aquarium visuals and prevents water tracking issues.
Key Features
Eliminates Display Tank Micro-Bubbles: Traps and collapses fine air mist inside the coarse foam wall before it can pass over the glass aquarium lip.
Maintains True Internal Water Lines: Open-pore geometry allows water to flow smoothly, preventing backpressure that could cause the main skimmer collection cup to flood.
Glueless Maintenance Access: Sliding friction-fit profile allows you to slip the sponge off the square pipe lines in a single movement for lightning-fast rinsing.
(Note: This retail SKU contains (1) individual standalone replacement square pipe sponge block. Acrylic skimmer bodies, overflow boxes, clear output pipes, and full Aquatrance pump assemblies are sold under separate product categories).
Comprehensive Reef Octopus HOB Output Sponge Spectrum
| Component Foam Classification | Material SKU Identifier | Internal Cutting Core Profile | Primary Target Skimmer Platform Match |
|---|---|---|---|
| BH100 Square Pipe Sponge | ROP-HOB100-SS | Molded Square Core Channel | Classic 100-HOB (CLSC-100HOB), BH100, BH100SS, BH100T |
| 25/32mm Micro-Bubble Sponge | OCT-OS2532 | Cylindrical Round Core Line | Classic 90-HOB, BH90, Classic 1000-HOB, BH1000 |
| 40mm HOB Output Sponge Set | ROP-BWBPEG-LG | Oversized Large Round Core | Classic 2000-HOB, BH2000 External Hang-On |
What’s Included:
(1) Reef Octopus BH100 Injection-Molded Replacement Square Pipe Foam Sponge
Technical Specs:
Official Manufacturing Title: Reef Octopus BH100 Square Pipe Sponge
SKU / Factory Part Identifier: ROP-HOB100-SS
Internal Mounting Profile: High-Precision Square Slide-Through Channel Matrix
Primary Media Composition: Saltwater-Inert Coarse Open-Cell Polyurethane Foam
Primary System Pathway Track: Outflow Plumbing Discharge Micro-Bubble Pre-Filter Shield
Chassis Platform Compatibility: Form-Fitted for Reef Octopus Classic 100-HOB and Legacy BH100 Frame Layouts
- Unplug your Reef Octopus Classic 100-HOB protein skimmer pump from its electrical wall outlet.
- Locate the square acrylic or PVC discharge plumbing assembly running down the outside exit wall of the skimmer frame.
- Slide your old, degraded, or clogged square pipe sponge upward and completely off the bottom hook of the output tube. Pro Tip: If your previous sponge is heavily loaded with calcification or brittle algae mats, pull it away gently to prevent scratching or cracking the clear acrylic pipe flanges.
- Take the opportunity to wipe down the exterior of the square exit pipe with a soft rag to remove any lingering organic slime or encrusted salt creep.
- Take your fresh ROP-HOB100-SS replacement square pipe sponge out of its box and align its factory square center core with the bottom profile of your skimmer's output line.
- Slide the new foam block upward onto the pipe until it rests firmly in its original factory running alignment. Plug the pump back in to resume safe, micro-bubble-free skimming.
Pro Tips:
- Never Use Harsh Tap Water to Rinse the Foam Over Your Display Tank. Because this open-cell foam sponge acts as a highly effective mechanical trap, it will aggressively accumulate free-floating organic matter, detritus, and loose fish food particles alongside micro-bubbles. Over time, these trapped organics will feed localized colonies of nitrifying bacteria. If you pull the sponge off and smash-rinse it under unconditioned, chlorinated tap water right before dropping it back onto the tank, you will instantly kill off that beneficial biology and drop residual chlorine trace into your return lines. Always rinse the sponge inside a small container filled with spent tank water during your routine water changes.
- Routinely Squeeze Out Detritus Weekly to Prevent Nitrate Tracking Pumps. Because this sponge sits directly in the high-volume output stream of your protein skimmer, it will rapidly function as an active mechanical filter sock if left unmanaged. If you leave this foam unwashed for months at a time, the captured detritus and organic sludge will break down directly inside the high-flow output path. This decay converts waste directly into water-bound nitrates and phosphates, running completely counter to your skimmer’s purpose. Make it a strict habit to pull the sponge off and squeeze it clean at least once every week to keep nutrients low.
- Replace the Full Foam Block Every 6 to 12 Months to Prevent Structural Sag. Over months of continuous exposure to raw aquarium water, ozone treatments, and standard salt creep, the flexible plasticizers inside the polyurethane foam matrix will slowly dry out, stiffen, and break down. A worn-out sponge will begin to sag, tear along its tracking seams, or lose its structural spring—allowing micro-bubbles to slip through the gaps. To keep your display tank looking completely crystal clear, treat this sponge as a standard consumable hardware item and swap it out for a fresh OEM block once a year.