When you open a drinking establishment, refilling CO2 tanks will be something you will get comfortable with as time goes on. However, you may have some questions regarding knowing when the have your CO2 tank refilled. You want to make sure you don't run too low on the CO2, or the result will be some unsatisfied customers who aren't going to want to wait around for you to run and have the tank filled. Instead, what's going to happen is you are going to lose out on those customers, and they may not come back.
You should know how to check for leaks
Something you are going to want to know how to do when you are working with CO2 is to look for leaks in the tank. You should look for leaks anytime you feel the CO2 seems to be going down faster than you think it should, or if you have any other reason to suspect an issue, such as hearing a very faint hissing sound you can't locate the source of. You want to make sure you have any leaks addressed before refilling the tank. This is easy to do, and you have a couple of good options.
The method you choose just depends on what's most convenient for you to do at the time. You will need to turn the PSI all the way down to 0 and disconnect the keg before you start. One way to check for leaks is to mix a bit of liquid dish soap and water in a spray bottle. Spray the mixture on the connections and look to see if bubbles appear. If so, then there is a leak present. The other method includes placing the parts underwater, then looking for bubbles.
You want to recognize when your tank is running low
Filling your CO2 tank will begin by first being able to recognize when it needs to be refilled. There is a very simple way to determine if the tank is running low, and that is to see if you can easily lift it with one hand. If it seems quite light, then it's time to refill it. However, if you don't like the idea of needing to regularly lift the tank, then you can use the pressure gauge and when you see that it has gone under the point where it initially was, then you are going to want to refill it. If you don't catch it in time, then you will know it needs to be refilled immediately when you start to see much less carbonation and large bubbles.
For more information on CO2 refill, contact a professional near you.