Before buying more parts, I mapped out the entire system flow based on the materials I plan to use and the type of crops I want to grow.
This post is not about results yet — it’s about design logic.
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🔁 Water Flow Overview
1️⃣ Fish Tank
- 1× IBC tank
- Dedicated only to fish
Water exits the fish tank by gravity.
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2️⃣ Mechanical Filter Tank (200L)
First stop after the fish tank. Designed to:
- capture solid waste
- reduce debris before water reaches the grow beds
This keeps the grow beds cleaner and easier to manage.
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3️⃣ Grow Beds (4 units, single row)
Built from 2× IBC tanks, cut horizontally.
Each IBC provides two grow beds (top + bottom).
Grow bed configuration:
🟩 Grow Beds 1 & 2
- Styrofoam raft system
- Used for lettuce
- Lightweight roots, minimal clogging
🟫 Grow Beds 3 & 4
- Lava rock media
- Bell siphon system
- Suitable for heavier crops (cabbage, kale, etc.)
Water flows sequentially through all four beds.
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4️⃣ Sump Tank (200L)
- Final collection point for all returning water
- Positioned at the lowest level
- Ensures stable water level in the fish tank
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5️⃣ Pump Return
- Water is pumped from the sump tank back to the fish tank
- System runs in a continuous loop
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🧠 Why This Design Makes Sense (for me)
- Efficient use of IBC tanks
- Clear separation between:
- Simple gravity flow
- Easy to adjust or scale later
Nothing is built yet — this is the thinking stage documented honestly, before spending money or locking myself into mistakes.
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Does this layout make sense to you, or would you approach it another way?