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Re: [APD] carbo plus units and kh

Jerry Baker wrote:

>Derek Parr wrote:
>>We've been discussing on my local aquarium group list on how much more 
>>CO2 gas is lost using normal air tubing compared to that special "CO2" 
>>tubing they sell.
>>    Any opinions on the matter?
>I don't know about that, but I can tell you that regular old 1/4" HDPE 
>tubing (think R/O line) fits right over airline tubing barbs and is 
>probably impervious to gases at all.
Refer to this chart.  Then decide what normal airline tubing is.


Silicone is about the worst you can use.  Vinyl is good but breaks down 

I use Polyurethane.
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