100% co2 or 70/30 nitro?

[Jakeyboi]

100% co2 or 70/30 nitro? I use 100% co2 in my kegerator, but I'm noticing as my beers reach their desired carbonation they get more bitter. I don't mind it too much, it's a little bit harsh at first, but mainly the wife and some friends notice it more. I've read that co2 can do this somehow (can't remember how) and I'm wondering if I should get pub mix when I refill, would this help reduce this effect? Any experience / advice gladly welcomed.

Jake

 

[Plumb bob]

Carbon dioxide dissolved in water will make carbonic acid which is what gives sparkling water its distinct taste.
You might also taste it in your mouth if you encounter a CO2 leak.

 

[The Baron]

I dont think you can refill mixed gas in a co2 bottle and a mixed gas bottle uses a different reg I think the co2 is male on the bottle and mixed is female or at least mine is