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Discussion Starter · #1 ·
Just wanted to ask a Physics related question as to how I fill my bubble counter when the water has evaporated. I learned the hard time last time that even though I shut my filter off the water still comes firing down the CO2 tubing as soon as that airtight seal is broken. This is my CO2 setup:

As you can see I inject the CO2 gas into a reactor which is installed on the output of my Fluval 406 filter. When I unscrew the top of the bubble counter to fill it and the filter and solenoid are off you hear that trapped gas escape and then water comes pouring out.
 

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Do have check valves on any of the tubing?
 

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Discussion Starter · #4 ·
Do have check valves on any of the tubing?

The only check valves are between the needle valve and bubble counter. Are you saying using a check valve inline somewhere between the reactor and the bubble counter would stop the water when unscrewing the bubble counter to fill it?
 

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I recommend paying a little extra and getting a good high-quality check valve for your CO2 line. Don't use the cheap ones they sell at the major pet stores. They aren't super reliable. And you don't want to risk damaging your expensive regulator just to save a few bucks on a check valve.
 

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Discussion Starter · #8 ·
I recommend paying a little extra and getting a good high-quality check valve for your CO2 line. Don't use the cheap ones they sell at the major pet stores. They aren't super reliable. And you don't want to risk damaging your expensive regulator just to save a few bucks on a check valve.

I also already have two check valves on this system so this one doesn't have to be anything too premium. I just need to be able to fill the bubble counter every few weeks without having to clamp the tubing and potentially making a mess.
 

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I also already have two check valves on this system so this one doesn't have to be anything too premium. I just need to be able to fill the bubble counter every few weeks without having to clamp the tubing and potentially making a mess.
The two on the regulator don't count. You need another between the regulator and whatever you're diffusing with.
 

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I'm probably the wrong person to ask... I mean it's great... Like it counts all the bubbles and stuff :p but I couldn't tell you anything else.
I've always thought that "bubble counters" are mis-named. I mean, they don't actually count the bubbles. They just let you see the bubbles. You have to count them yourself. They should be called "bubble viewers." :icon_cool
 

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I've always thought that "bubble counters" are mis-named. I mean, they don't actually count the bubbles. They just let you see the bubbles. You have to count them yourself. They should be called "bubble viewers." :icon_cool
Absolutely agree. Although, with smaller tanks you probably can achieve the right CO2 level with a bubble count that is "countable". On my 75g and 2-125s I have no clue. However, I do use the BC to see that an adjustment to my metering valve is having an affect.
 

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Discussion Starter · #17 ·
Absolutely agree. Although, with smaller tanks you probably can achieve the right CO2 level with a bubble count that is "countable". On my 75g and 2-125s I have no clue. However, I do use the BC to see that an adjustment to my metering valve is having an affect.

Yeah I know what you mean. When the water has evaporated out of my bubble "viewer" I feel like I'm not changing the flow of CO2 but it's obviously still flowing. It's just a reassurance to see it happening.
 

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Why not use mineral oil in your bubble counter and not have to worry about it evaporating?
 
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