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re:5lb. CO2: How long should it last?

>>I have a dual gauge single stage regulator bubbling
CO2 into a sintered
glass diffuser.  I have the flow turned down to 6-8
bubbles per minute into
a 20 gallon tank running at about 10-12lbs of pressure
through a metering
valve (marine monsters).

My question is this, How long should a 5 lb tank last.
 My don't seen to
last more than about 3 months, although I have tested
for leaks by spraying
the set-up with soapy water.  I suppose the expense is
 not killing me, and
the tank is doing fantastically well, but the
consumption seems excessive.


>>In sunny, but not so warm SW Florida

The 5 lb. tank on my 29 gal aquarium lasts over 1yr. 
I inject at 10 psi into an Eheim difussor.  You may be
losing too much CO2 due to surface agitation.


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