Correction: Oxygenation

In my writeup of oxygenation, I screwed up some of my basic chemistry.  A mole of O2 masses 32 grams, not 16 as I used.  That will halve the times listed:  To get one ppm of oxygen in 20 liters (five gallons plus about a quart) at a flow rate of 1/32 liters per minute, you’ll need half of 1.2 minutes, or about 0.6 minutes of oxygen flow.  Round up to account for inefficiency and you can just about say 1 minute per ppm desired.  For 8 ppm, use about 8 minutes.

It’s been 40 years since high school chemistry.  I apologize for the error.

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