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I took a beginner way into co2 by purchasing the Hagen System. I orginally purchased one system and then another, but am only using one of there ladder diffusors. I have the two cansister joined together by a t-valve that then directs the flow into the tank and diffusor. So far after one day the bubble rate hasn't increased. Can the t-valve affect the bubble rate.

Can a t-valve be use either way 1 to 2 lines or 2 to 1 line. Thanks!
 

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I had that problem at first with my 2 DIY CO2 bottles. Check valves cured my problem as one bottle produced faster and thus had a greater pressure which would also go into the other bottle. Once the pressure in the other bottle was up the flow switched back into the first bottle.
 
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