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Re: Has anybody had "exploding" 2-liter pop bottles?

David writes:

>  I just wanted to clarify... what is the definition of a "rigid"
>  bottle?  In the past, I've used standard 2-liter pop bottles
>  without any troubles.  I consider these rigid because they hold
>  their form when empty.  However, since they are made of plastic
>  they are easily collapsable if you squeeze them.  Are these the
>  ones that are not recommended?

Yes, these are the ones that are not recommended.  The "rigid" ones are more 
like the ones that juice and juice drinks come in.

>  If so, has anyone had any experiences where these bottles
>  exploded?
>  "Standard" 2-liter pop bottles (I can only speak for those that
>  I'm familiar with in the US) are designed to hold up under
>  pressure since pop is pressurized.  A DIY yeast reactor should
>  be very low pressure (only the amount of pressure required to
>  equilize at the depth the output is placed in the aquarium +
>  any backpressure that might exist depending on your setup).

It's not that they explode that is the problem.  They have been known to 
collapse when the CO2 generation ends.  This can push crud into your tank.
>  So, I wouldn't think these would be a problem.  I'd like to know
>  if my thinking is flawed and I've been waiting for a disaster
>  to happen.

  Yes, the bottles are engineered to withstand outward pressure from withing, 
but when the pressure outside exceeds the pressure inside, they DO NOT hold 
up.  They are not engineered for that.

Bob Dixon