Update 9/4/2020: After telling the seller to send me the unit which has been sent back to the warehouse so I can use the parts . by him. I will report on the parts replacement and if it lasts longer. I really think this is a great do it yourself CO2 system for aquariums, I'm just worried about parts failing. I've found that you can buy a replacement solenoid from Revain, but it's $20, which is pretty expensive. Because the bubble counter uses a quick connector and the solenoid is built into the bubble counter, you cannot buy another solenoid. *Original* In fact, the build quality of the entire system is excellent. It is very easy to produce and operate CO2. I should probably do this once a week for a 40 gallon tank. However, when I bought it, I had concerns about whether the magnet would hold. I've only had it less than a month and the solenoid seems to be failing. At first it didn't work. After I cleaned it and pushed a few buttons, it turned on. But after a while, even when it's on, it seems it closes inside because the light is on like it's open, but it stops releasing CO2. Resetting it works, but only temporarily. I have messaged the seller hoping to fix the problem or replace the solenoid. I will edit my review as soon as I get a reply.
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