is your pH easily changeable? of course. is it advisable? Probably not. a sudden pH fluctuation will kill your fish in a heartbeat. I didn't read that fact anywhere, I crashed the pH and killed an entire tank in under 10 minutes. If you are wanting to put your pH to a certain level and keep it there forever, aint gonna happen unless you maintain your tank properly to keep it there. the ro
will give you the water with low pH, that's it. what happens after is up to you.
I'm not gonna get into all the science of the ro
and everything it does, but all you are concerned about is it removes tds
and lowers pH. Next time I get around to it I will actually test the water in my holding tank that comes directly from the ro
unit to see what the pH is. typically it's around 6-ish. with all that is going on in my tanks it comes up to around 6.6. I have an angelfish tank. I have a discus tank. I have two saltwater tanks.