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  • I would be concerned with off-gassing from the plastic pipe let alone an inner tube - think how much they smell. Food grade materials might be worth looking at instead.

  • Just asked and apparently it's only measuring CO2, so hopefully that is less of a problem.

    As an aside the baseline concentration of CO2 in our garden is around 417ppm!

    @Pifko that would be ace, just as an experiment - will pm.

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