Reddit reviews Learn to Brew Nylon Washers for Co2 Regulators, Set of 6

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Milwaukee regulator

disposable seals

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Basic components of a pressurized CO2 system:

• Regulator -controls flow of CO2 gas into your aquarium
  
  
• CO2 tank - consistent, pressurized source of CO2
  
  
• Diffuser - breaks down CO2 gas into teeny tiny bubbles for plants to use
  
  Regulators: there are many brands and components to a regulator. I recommend a regulator with a solenoid, and a bubble counter. The solenoid allows you easily control your CO2 using an inexpensive timer, or an expensive pH controller. A bubble counter is a simple way to guess how much CO2 gas is in your aquarium. You may want to shoot for 3-4 bubbles per second depending on lighting and plants. I personally recommend the Milwaukee regulator and have used one reliably for years.
  
  CO2 tank: A 10 lb tank might last you 3-4 months before needing refilled. You can get a 20lb but they are huge and ridiculously heavy. On my 29gal, a 10lb tank lasts 6 months. Tanks ship empty and you have to find a local source to fill it with CO2. Try welding supply or home brew beer supply. You will need disposable seals too.
  
  Diffuser: This is where you have a lot of options. Ceramic diffusers are effective on small-medium tanks. CO2 reactors and DYI options using your filtration system are effective on a large size tank. I can't give any recommendations on these 2 options, sorry, hopefully someone will chime in.
  
  Other important equipment includes CO2-safe tubing, a drop checker, maybe a brass check valve if needed, and the aforementioned timer. Hit me up if you would like recommendations for these items.