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Old 03-26-2010, 08:46 AM   #291 (permalink)
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Default Re: Tiny super efficient CO2 reactor

Also, what's the difference between CO2 tubing and air pump tubing? I saw some black air pump tubing the other day in my LFS and I'd prefer to use that.
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Old 03-26-2010, 08:48 AM   #292 (permalink)
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Default Re: Tiny super efficient CO2 reactor

Quote:
Originally Posted by kcrossley View Post
Yep, that's exactly what I was going to do. The plastic housing hole will also help secure the airstone to the CO2 tubing. BTW, what's the purpose of the foam?
that causes the (already very tiny) bubbles coming out of the filter to stay in contact with the water longer/ make those tiny bubbles even smaller. I've seen some in this thread don't use it at all, I still do.
(incidentally, the sponge/ foam already has a hole cut into it... just stretch it over the outlet and it stays well in place.)
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Old 03-26-2010, 09:00 AM   #293 (permalink)
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Default Re: Tiny super efficient CO2 reactor

Quote:
Originally Posted by kcrossley View Post
Also, what's the difference between CO2 tubing and air pump tubing? I saw some black air pump tubing the other day in my LFS and I'd prefer to use that.
airline tube (vinyl) doesn't hold up as well over time to the acid created by producing CO2 (this is the acid that causes the PH to drop when using Co2.) also (to some degree) the co2 is able to escape through the walls of the tubing... sort of the way a helium balloon will deflate much quicker than one filled with air.

Borrowed the following from another forum:
http://www.coleparmer.com/techinfo/t...tingTubing.htm

CO2 permeability (cc.mm/cm2.sec.mmHg) x 10^-10) (lower number = better)
FEP @5.9
PTFE @ 6.8
PVC @ 6.8
Nylon @ 20
Viton @ 79
Polypropylene @ 90
Tygon Fuel @ 100
Polyethylene @ 280
Tygon Lab @ 360
Vinyl @ 360
Polyurethane (clear and aqua-tint) @ 395
Norprene @ 1200
Gum Rubber @ 1311
Tygon Pressure @ 2700
Tygon Ultra-chem resistant @ 4840
Silicone @ 20,132

(btw, you can typically get polyethylene or polypropylene at hardware store/ HD/Lowes...)
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Old 03-27-2010, 07:31 AM   #294 (permalink)
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Default Re: Tiny super efficient CO2 reactor

Also remember that the price of 10 lbs. of CO2 is about $15.

Consider that when thinking in terms of (cc.mm/cm2.sec.mmHg) x 10^-10).

--Nikolay
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Old 03-27-2010, 07:43 AM   #295 (permalink)
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Default Re: Tiny super efficient CO2 reactor

Quote:
Originally Posted by Big_Fish View Post
airline tube (vinyl) doesn't hold up as well over time to the acid created by producing CO2 (this is the acid that causes the PH to drop when using Co2.) also (to some degree) the co2 is able to escape through the walls of the tubing... sort of the way a helium balloon will deflate much quicker than one filled with air.

Borrowed the following from another forum:
http://www.coleparmer.com/techinfo/t...tingTubing.htm

CO2 permeability (cc.mm/cm2.sec.mmHg) x 10^-10) (lower number = better)
FEP @5.9
PTFE @ 6.8
PVC @ 6.8
Nylon @ 20
Viton @ 79
Polypropylene @ 90
Tygon Fuel @ 100
Polyethylene @ 280
Tygon Lab @ 360
Vinyl @ 360
Polyurethane (clear and aqua-tint) @ 395
Norprene @ 1200
Gum Rubber @ 1311
Tygon Pressure @ 2700
Tygon Ultra-chem resistant @ 4840
Silicone @ 20,132

(btw, you can typically get polyethylene or polypropylene at hardware store/ HD/Lowes...)
So, what is CO2 tubing made out of? Also, are you suppose to put the foam over the adjustable output diverter?
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Old 03-28-2010, 11:04 AM   #296 (permalink)
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Default Re: Tiny super efficient CO2 reactor

Has anyone tried this on larger tanks? I have a 55 gallon and was thinking about trying this.
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Old 03-29-2010, 10:05 PM   #297 (permalink)
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Default Re: Tiny super efficient CO2 reactor

Yep. I have one setup on my 55g with one 2 liter bottle.I use an hob filter with a second 2 liter bottle.
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Old 03-30-2010, 10:18 AM   #298 (permalink)
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Default Re: Tiny super efficient CO2 reactor

Quote:
Originally Posted by tbonedeluxe View Post
Yep. I have one setup on my 55g with one 2 liter bottle.I use an hob filter with a second 2 liter bottle.
Does it only "work" with DIY? I was going to use it with my non-DIY CO2
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Old 03-30-2010, 07:18 PM   #299 (permalink)
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Default Re: Tiny super efficient CO2 reactor

I just set this up earlier today and it's "shooting" CO2 once every 3 seconds. Is this good? Or should I be getting more?
This is the recipe I used:
2 Cups of Sugar
1/2 teaspoon of yeast
1/4 teaspoon of baking powder
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Old 03-30-2010, 09:50 PM   #300 (permalink)
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Default Re: Tiny super efficient CO2 reactor

I guess a million pages in a thread makes people read just the last post and go from there.

Yes, the cheap contraption is good for larger tanks too. I have it in a 180 gal. tank and it works just fine. Lowers the pH at least 0.5 units in an hour or so.

Works fine in a 55 and a 75.

Use it with pressurized or yeast CO2.

Nothing much more to say - the thing works and for $10 you can't find a more efficient reactor.

--Nikolay
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