Automatic Pressurized CO2...how accurate is this?

I have a setup similar to the one at Doc Smith's and the only thing i don't like is that every once and awhile i have to clean the tubing out. The tubing gets all type of debris over time. I used an old water vacum as my chamber and hooked it to a rio 600 pump. works well and easily dissolve all the co2 bubble inside. I have the out put placed by my HOB intake
 
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