DIY c02 - The Planted Tank Forum
 
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post #1 of 6 (permalink) Old 10-03-2014, 12:49 PM Thread Starter
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DIY c02

Can I go to Home Depot and buy a 5lb cylinder with c02 and buy the pressure value ..can I buy the bubble counter and diffuser????
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post #2 of 6 (permalink) Old 10-03-2014, 01:11 PM
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no most of the stuff is you could get from a welding supply or home brewery store.
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post #3 of 6 (permalink) Old 10-03-2014, 01:26 PM Thread Starter
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Is that a good start
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post #4 of 6 (permalink) Old 10-03-2014, 01:31 PM Thread Starter
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So I can buy a 5lb tank reconditioned from a brewery but what else do I need they sell dual gauge values is that good so far
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post #5 of 6 (permalink) Old 10-03-2014, 04:59 PM
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You don't need dual gauges on your regulator. The high pressure-side gauge is nearly useless. You should be able to get a single or dual gauge regulator at a homebrew shop, amazon, welding supply, or any number of other places.

Disclaimer: I don't do CO2 for aquariums (yet?), I do it for homebrew, and I have a dual gauge regulator, because I thought I needed it.

The high-pressure gauge pretty much only tells you if the tank is empty, nearly empty, or isn't nearly empty. It will not tell you the difference between a full tank, half full tank or quarter-full tank, as those will all read the same.

The pressure does not drop off as the tank empties, it only starts dropping when you are getting very close to empty. This happens because the CO2 is liquified in the tank. The pressure of the tank will be whatever the vapor pressure of CO2 is for the ambient temperature, until you've drained off enough that all the liquid is gone. Only then will it drop, but at that point you've used most of the CO2 up. I keep mine in a keg fridge at 40F, so it sits just under 600PSI, as that's the vapor pressure of CO2 at 40F. In a heated/cooled room it will sit somewhere between 800PSI (~65F) and 900PSI (~75F). It really makes a better thermometer than gas level gauge.

A decent bathroom scale is a better way, as you can weigh the tank and tell how much gas you've drained. A 5lb CO2 bottle should weigh its stamped tare weight when empty, and tare+5lbs when full.
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post #6 of 6 (permalink) Old 10-03-2014, 06:41 PM
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Quote:
Originally Posted by mattinmd View Post
It really makes a better thermometer than gas level gauge.
That is sooo true..
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