For my Co2 systems, i always put a check valve in between the reactor and bubble counter, this is mainly so that the dirty water from the aquarium doesn't back flow (when the Co2 solenoid is off) and enter the bubble counter, mixing with the clean distilled water inside it. It helps to prevent algae growing inside the bubble counter.









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so far no algae problem.

Now I am lazy to install it since everything setup. So far no algae inside that too. 







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