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Discussion Starter · #1 ·
How do you really add C02 into the Ehiem 2213, and I will be using a 2 liter bottle.
 

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I don't think I'd use the filter intake w/DIY CO2. I'd be afraid of it sucking the mixture out of the bottle into the tank.
 

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just position the air line so that the Co2 bubbles freely get sucked into the intake of the filter. I usually position it about and inch or more directly below the intake. I've pulled a vacuum on a 2 liter bottle before by having the hose directly into the intake and it collapsed the bottle. Luckily it didn't pull the mixture through the hose.
 

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I drill a hole in the intake an push the tube inside it. I have never had a problem, and I don't even use a check valve.
 

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Discussion Starter · #8 ·
Okay, so basically the same thing that I did with my filter intake, I used a bit with the diameter of the air tubing and drilled and just pushed the tube through. I'll have to look at it when ever I get the filter.
 
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