Jan 12 • General discussion
Challenge #1 – Grow Media Math Fail (and a Course Correction)
Today’s update is a classic beginner mistake — but worth documenting.
I miscalculated the grow media volume.
Because of that error, the total media cost for 4 grow beds turned out to be almost 4× higher than my original estimate.Not a small difference — enough to force a rethink.
What I’m changing 👇
Instead of filling all 4 grow beds with the same media:
• 2 grow beds → Styrofoam rafts (DWC) for iceberg lettuce
• 2 grow beds → Lava rock for cabbage & kale
This hybrid setup keeps the system functional while significantly reducing upfront cost.
Media numbers (important part)
For 2 grow beds with lava rock:
• Total lava rock needed: ~500 kg
• Cost range: 12,000 – 15,000 CZK
• That’s roughly $500 – $630 USD
If I had filled all 4 beds with lava rock, the number would’ve been painful enough to slow the whole project down.
What I’m doing next
• I’m actively researching cheaper IBC tank and Media (lava rocks) sources
• Looking for better local suppliers and logistics options
• No purchase yet — documenting before locking decisions
Lesson learned 🧠
• Small calculation errors scale fast
• Grow media is not a “minor” cost
• Hybrid systems = flexibility for beginners
No panic, no rushing — just adjusting the plan and moving forward.
More updates soon as I finalize sourcing.
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Challenge #1 – Grow Media Math Fail (and a Course Correction)
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