I’ve been using my kegerator to make carbonated water so my wife will stop spending $1/liter on the bottles at the grocery store. The problem is there is a funny twangy taste to the water, and I can’t help but think I’m smelling and tasting the gas from some of the kegs hooked up to the same CO2 tank. A system diagram is shown below. I do have the ball check valves at every connection similar to NB item#K125.
Last year I tried making a whole keg of carbonated water, and it was fine initially but after 3 weeks tasted strongly of beer. I have since discovered one of the check valves was a cheap plastic cone instead of a ball, so I replaced it but have yet to try the full keg again.
Recently I’ve been using the carbonator cap on individual bottles and they still have that subtle acidic twang that I don’t get in the store bought water. Could this just be the residual beer in the gas line between the QD and the check valve? Is anybody else having this problem or can you suggest something to try?
The K125’s are represented by the little purple squares, and the orange squares are 1/4" FPT air tool splitters from harbor freight. The low pressure regulator does pass 30 psi to one line through its high pressure port.