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RE: RE: Glycerine in bubble counters

Nick Anderson said

> I have been using some 100% glycerine in my bubble counter for a couple of
> months now with no noticeable change in level.  The bubbles don't seem to
> impeded by the viscosity of the glycerine and it makes the counting a
> easier as the bubbles travel more slowly through the liquid.  I imagine
> if you tried to water it down, the water would be lost rather quickly due
> evaporation.  If you want a liquid that is a little less viscous that
> glycerine, you might try a mineral oil.  BTW, I added a bit of food
> to my glycerine just for fun, probably not necessary though.

I have a new bubble counter as well, and it is one that I made myself
from a very tiny plastic pop bottle (about 1/2 the size of a regular one
serving bottling). I tried Tom Barr's recommendation of just using
water, and after about 4-5 months on the system, I have lost virtually
no water. I wouldn't bother with anything else as it seems to be more of
a risk of getting extra stuff in the tank.

Ed Dumas


I guess it just depends on your individual system.  Mine is store bought.
It would lose almost all of the water to evaporation within a week.  The
risk of bubble counter liquid escaping into the tank for me is next to zero
as my entire system is located under the tank.  Even if I had some
catastrophic failure (power, check valve 1-3), the risk would be getting the
liquid into my CO2 tank and not the aquarium due to the backpressure (siphon
effect).  For me it is only a matter of convenience with very little risk
associated with it.  I'll spend my time worrying about things that are a bit
more likely to go wrong with such an inherently complicated system.

Nick Anderson