Depends on your pH levels and how you gas out. I just installed an HMA filter to eliminate the prime conditioner, my pH difference is almost by two after aging the tap so I have little in the difference in my pH, but I do still have to worry about gas out. My water has fluoride and chloramine in it, so my HMA filter is designed to take out chlorine, chloramine, and ammonia, I will add the fluoride filter down the road.