A Balloon Turned Into a Drainage Solution (rafael_pedreiro.bg)

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This is genius. Instead of buying expensive molds, this guy just uses a regular balloon to shape a custom rainwater drainage box. It’s cheap, clever, and surprisingly accurate. He starts by prepping the area and pouring concrete around the inflated balloon, which forms the cavity. Then, to keep debris out, he lines the bottom with stones—creating a natural filter that stops soil from blocking the flow. Once the concrete hardens, he pops the balloon, revealing a smooth, durable funnel that's both functional and cost-effective.

What do you think—crazy smart or just crazy?


Credit: @rafael_pedreiro.bg - IG