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I am in the process of setting up my first planted tank with pressurized CO2. I will be using an inline diffuser which requires a minimum working pressure of 25-30psi. My question is how do you use a bubble counter (with that high of pressure) without all of the water being forced out each time the solenioid valve opens?
 

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Water is MUCH more dense then CO2, you just put you bubble counter before your diffuser (like on the needle valvle), make sure its vertical and it wont cause any issues.

Kinda like this one (that I use):

 

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Bubble counters work by having the CO2 enter the bubble counter below the surface of the fluid in the bubble counter (generating bubbles), and exiting above the surface of the fluid in the bubble counter so the fluid doesn't get pumped into the fish tank.

Hope that answers your question, or my apologies for not understanding what it is you're asking...
 

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I run a bubble counter on my regulator and an in-line diffuser at 30 psi and I don't loose any water from the bubble counter.
 
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