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Old 04-20-2013, 10:22 AM   #1
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DIY CO2 setup

Here it is:

Works great, baking soda in one bottle, citric acid in the other, connected to a solenoid and then into the tank.

I wanted a DIY CO2 system that can be used with a solenoid. When the solenoid is closed at night, the pressure builds in the bottle until 3.6kg/cm2, then a safety valve slowly opens (it's like a spring) and brings the pressure back down to 3.2kg/cm2. Rinse and repeat.

Basically a nice solution to having a diy co2 system that can only run during the day, without worrying about pressure in the bottles increasing too much when it turns off at night. Only slight pet peeve is a bottle can handle probably 7 or 8kg/cm2, but that safety valve wont let it get near that.
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Old 04-20-2013, 11:17 AM   #2
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That's pretty interesting where did you get the solenoid to fit those bottles? Could you post a how to ?
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Old 04-20-2013, 11:20 AM   #3
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Quote:
Originally Posted by bshenanagins View Post
That's pretty interesting where did you get the solenoid to fit those bottles? Could you post a how to ?
+1. Sounds interesting.
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Old 04-20-2013, 11:21 PM   #4
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Both components are branded WYIN, i'm new on this site, mods forgive me if posting links to a product isn't allowed (i don't advertise or sell this):

Blue bar:

blue bar

Solenoid:

solenoid

Basically i'm in China so it's easy to get here. That seems to be the 'company' website, but I got them from 'taobao', biggest online shopping site in China where you can buy next to anything.

The connection between the fine tuning valve on the blue bar to the solenoid is simply a piece of air tubing. Total cost around 28USD, but aquarium things are cheaper here.
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Old 04-21-2013, 11:27 AM   #5
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Here's a youtube vid of the system running:

DIY CO2 FISH TANK - YouTube

Atm the bubble counter isn't showing any bubbles on the '4 in 1' atomizer in the tank, not sure why. Other than that seems to be working well.
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Old 04-23-2013, 03:49 AM   #6
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That unit runs 43usd on ebay. I was looking at it yesterday. Glade I seen this info before I purchased it not sure if I will now bit I so have a question how long does the citric acid and baking soda system last. I currently am running a yeast driven system.
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Old 04-23-2013, 10:24 AM   #7
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lasts 25 days if you turn it off at night, thereabouts. You're supposed to use 2 liter coke bottles, one drips into the other creating the reaction. I'm no chemist but it works.

Don't complain about price lol, aquarium items are one of the few things that are cheaper here (in china where it is made) than almost everything else.

I also build computers and pay about 30% more for every component than Americans enjoy. You'd only want this particular setup if you want the pressure gauge, safety valve and fine tuning valve all in one without much work to set it up. Of course you could just get those components separately.

That's the advertisement, i'll have to run it once the tank is fully set up to definitively say how long 200g baking soda + 200g citric acid powder lasts.
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Old 04-23-2013, 11:18 AM   #8
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Thank you for the information. I think ill just add a pressure gauge to my homemade diy system.
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Old 04-15-2014, 07:06 PM   #9
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With solenoid It won't explode at night?
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Old 04-15-2014, 10:53 PM   #10
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Thats awesome!

Sent from my SGH-T889 using Aquarium Advice mobile app
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