I want to start by saying this CO2 generator and injection kit is amazing for the price. I bought it about 3 weeks ago and my plants have shown explosive growth. Their colors are also much brighter. The build quality is excellent! Once you get the hang of it, the generator is incredibly easy to fill. It comes with everything you need for CO2 injection. I have included before and after photos to show how this system has affected my tank in four weeks. Cons: - Instructions are not very clear. Despite being in English, they don't explain very well what each part does and how it all fits together. It's easy to set up, especially if you already know what one of these systems should look like. I was able to assemble it just by looking at the picture. The diffuser needs a few days to work properly. The product description mentions this issue and says to put on the rubber strap (included) for a few hours before using the diffuser. Otherwise, CO2 will emanate from below in the form of huge bubbles. That's a design flaw, but I had a new diffuser on the way, so it didn't bother me too much. Water seeps from the bubble counter into my air hose. I have to refill the bubble counter and blow the liquid out of the tube about once a week, but it's not a major inconvenience. Pros: - Amazing build quality. Everything appears to be stainless steel. The system does not emit any CO2 at all and the regulator works accurately. - The solenoid has been working for three weeks and saves me having to turn the system on manually. - Price-performance ratio! I have not seen any other system at this price. It includes a cylinder, regulator, solenoid valve, bubble counter, air hose and diffuser - everything you need to get started with CO2 injection. - Easy to refuel. I didn't want to go to the paintball shop to refill my CO2. I wanted something that worked consistently and didn't rely on homemade kits. This is perfect for my needs and will last about 3-4 weeks for my 20 gallon grow tank before needing a refill. I vent the remaining CO2, unscrew the regulator and add 200g baking soda and 200g citric acid. Then fill in 300 ml of water and turn the regulator back on! It takes about 24 hours for the print to reach 20kg/cm2, but at 10kg/cm2 it is ready to use. Tips: The o-ring that fits between the regulator and bottle expanded when I took the system separately to refill. This is easily fixed by placing the o-ring in boiling water for 7 minutes.
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