Instruction: Given a question and the related document, and generate the answer to the question based on the information provided in the document.

Input:
Question: Did I miss the estimate of how many gallons this could push at, say, 10psi?
Document: The product works as advertised. It generates a slow serving pressure, with a nice pour out of my Cornelius Keg. It moves quite a bit of volume with one cartridge. I would estimate 3 cartridges would displace the entire 5 gallons (did not use mathematics in my estimation). I would not recommend storing the keg at this pressure though as the beverage may lose carbonation over time.I lost the first cartridge because I was not warned that the puncture would take place on the screw in.
It takes abotu CO2 cylinders to dispense 5 gallons. I love it. It is so much easier when I take my homebrew to gatherings away from my house. It's not designed and not suited for carbonation.
We use this to serve beer out of corny kegs. Takes about 4-5 cartridges to serve 5 gallons. I recommend to put some food safe o-ring lube on the tip of your CO2 cartridge before screwing it in to get a good seal on the gasket.
I was pretty disappointed with this, actually. It leaks after you pull the trigger, so you can't leave it hooked up. And it took two cartridges to push a 3-gal corny keg. I tried a threaded and an unthreaded cartridge, it didn't seem to make much of a difference. Oh, and it's not totally clear from the description that it doesn't come with the fitting (ball-lock or pin-lock) you need to attach it to the keg.
Use it to push out all your beer into a few pitchers and drink up with your friends.Other comments on here about exploding canisters might be doing something wrong. I have had no issues what so ever - just follow the directions. "never attach ball/pin valve to the inflator first" it says on the thing. put the valve on the keg first, crack your canister then attach that to the valve. simple. I use cornelius ball lock valves and it works just fine.
I already have one that uses the unthreaded cartridges so I ordered this one so I could do both of my kegs. This one came with threads even through the description says it uses unthreaded cartridges. Now I have to either go through the hassle of sending it back or buy threaded cartridges.
Overall, I can't recommend it.
Not very effective on kegs. Only lasted a few drafts before I had to which out. I woould go with a small CO2 tank instead.
This is the second time I have purchased this product from this vendor . The product works well and comes with one threaded co2 cartridge. No instruction. Product arrive quickly and does what I need it to do.
I ordered this charger as the ad posted it was new and it came with a C02 cartridge when I received the package in the mail today the item was just inside a mail envelope no product packaging and no cartridge, I'm disappointed.
Answer: David,  I use 2.5 gal mini kegs and this charger will empty two kegs with one 16 gram cartridge.My taps are mounted directly to the liquid quick connect with no lines used so pressure is not an issue.  When the flow gets weak, I pull the trigger a couple times to give it some more gas.  I like them, no leaks and the control is good. I hope this helps.