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how to know if 85% of Co2 is released within 2 mins?

There is no way to determine this.The complete system is designed in such way that all including syphon tubes, flexible hose dia, main maniflold dia, no of nozzles, nozzles dia etc etc and all such design based parameters would ensure that atleast 85 percent Co2 is relased within 2 mins.

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  1. Is there pressure gauge fitted on manifold, can we determine by that reading if it start to decrease after release of co2

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