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It is normal if you are using those cheap plastic check valve. Get those metal check valve much better.
I don't know why does this happened, this is my 2nd check valve already, been tested with the check valve confirming that its only 1 way out & another way blockage. But when i plug in together on my co2 unit, the water from the bubble counter still able to backflow pass through the check valve.
Also i had placed the check valve above water level.
== Ngiam ==
It is normal if you are using those cheap plastic check valve. Get those metal check valve much better.
aiya...cause the first one i'm using is Ista brand, it still passed, then use this normal plastic also passed.
Metal type, is there any brand to recommend?
== Ngiam ==
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