Fluidized Bed Reactor for RedSea Sump

🔧 RedSea Reefer 250 G2 – Modular Overflow Insert with Integrated Fluidized Bed Reactor

💡 Concept & Design Philosophy

This modular overflow insert was specifically designed for the RedSea Reefer 250 G2 sump overflow.
It combines an overflow comb and a fluidized bed reactor into a single, compact, pump-free solution.

No external reactors.
No extra pumps.
No hoses.

👉 The system is driven entirely by the overflow flow.

🧠 The Key Innovation: Exposed Gyroid Core

The real magic happens during printing:

• The model is structurally solid by design
• Top layers = 0
• Bottom layers = 0
• The Gyroid infill is intentionally left exposed

This turns the infill itself into the reactor core.

Why Gyroid?

Gyroid is ideal for water filtration:

• ✅ Fully water-permeable
• ✅ No dead zones
• ✅ Uniform flow in all directions
• ✅ Extremely strong with minimal material
• ✅ No clogging pathways

➡️ Water is forced through the Gyroid structure, ensuring maximum contact time and efficiency.

🧩 Modular System – Two Interchangeable Combs

The reactor body is identical — only the comb changes:

🔹 Coarse Comb Module

• High flow capacity
• Ideal for strong return pumps
• Very low clogging risk

🔹 Fine Comb Module

• Protects snails and small livestock
• Smoother surface flow
• Cleaner visual appearance

Both combs are fully interchangeable and use the same reactor housing.

🌊 Supported Filter Media (Saltwater Aquarium)

This integrated reactor is compatible with all common saltwater filter media, especially:

🧬 Biological Media

• Siporax
• Seachem Matrix
• MarinePure
• Biohome Marine
• Ceramic rings / bio media pellets (passive use)

➡️ Excellent for biological filtration, nitrification & denitrification.

🧪 Chemical Media

• Activated carbon - ensure that it´s not tumbling!
• Phosphate removers (GFO / iron-based)
• Aluminum-based adsorbers
• Zeolite (passive use)

⚠️ Note:
This is not a pump-driven pellet reactor, but a passive fluidized hybrid optimized for overflow-driven flow — making it extremely quiet and maintenance-friendly.

🖨️ Critical Print Settings (Important!)

Recommended slicer settings for the selected heights:

• Infill pattern: Gyroid
• Infill density: ~ 10%
• ❌ Top layers: 0
• ❌ Bottom layers: 0
• Wall count: 2–3 perimeters recommended

✔ Result:

• Structurally solid reactor base
• Fully exposed Gyroid core
• Maximum water flow
• No post-processing required

🧱 Material Recommendations

• ✅ PETG (strongly recommended)
• ✅ ASA / ABS (for experienced users)
• ⚠️ PLA not recommended (continuous water + temperature)

🚀 Advantages Over Traditional Reactors

✔ No additional pump
✔ No hoses or plumbing
✔ No external equipment
✔ Silent operation
✔ Modular & serviceable
✔ Optimized for RedSea overflows
✔ Low maintenance
✔ Prints cleanly and reliably

🧠 Who Is This For?

• RedSea Reefer 250 G2 owners
• Reefers who want less equipment
• Makers who love functional engineering
• Aquarists focused on flow efficiency & biology

📦 Included Files

• STL – Fluidized Bed Reactor Body
• STL – Coarse Overflow Comb
• STL – Fine Overflow Comb