This product is well made except for the valve. The instructions were followed and the correct proportions entered into the system. The system worked for 10-12 hours and then I turned it off for the night. Knowing I can't turn it on in the morning because I have to work, I left it off. I got home a few hours later and CO2 was pouring out of the diffuser. I ripped out the tubing and checked to see if the needle valve was open. It was of course sealed and CO2 was pouring into my tank. i have a lemon The valve has failed and cannot hold the pressure. For god knows how long my fish was desperately gasping for air at the top of the tank. This system nearly killed my fish and may kill them in the coming days. Perform an emergency water change and ventilate the aquarium as soon as possible to remove carbon dioxide. I learned the lesson of interviewing the valve manufacturer and making sure I can see the quality control results of their valves. I will not buy this product again.
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