Is a check valve truly important for DIY CO2? Can it wait a few weeks or should I get it right away? I want to setup the CO2 ASAP but dont have enough money to get the check valve.
What is Ninja's. I seen this in a lot of threads.Yes I recommend a check valve, and simple plastic one should suffice. they cost 1.99 the last time I went to petsmart.
If you don't have a checkvalve, you may have too much back pressure, and all your yeast would go into your tank and have it all over your floor etc. Smells like bread and alcohol. Not a nice smell.
Edit: Ninja'd lol!
The bottls is going under the tank. I will have the check valve over the tank for sure. I learned the hard way last time.I know it's a little late now, but thought I would mention that if the bottles are stored above the height of the tank the need for check valves is greatly reduced as there is less chance of water going up the hose fighting gravity the whole way. There is still a small chance of water flowing back to the bottle if the atmospheric pressure outside the bottle increases to be larger than the pressure inside the bottle. This happens when your bottle runs out of CO2 on a low pressure day, and you don't notice until a high pressure day.
Your barometric pressure probably doesn't vary more than 2.0 inches of mercury from one extreme to the other which converts to which converts to 27 inches of water column. So you'd need a height above the tank water level of atleast 27 inches to completely eliminate this possibility and the need for a check valve.
I've also found that as the check valves get wet from tank water they tend to get a build up on them that causes them to get stuck and fail. I highly suggest keeping the check valve as high as possible above the tank water level.