For anybody who is reading this thread, PH and alkalinity are related to each other except in certain conditions, one being the introduction of ozone and the other being salt generation. I would not have a pool or spa without worrying about the alkalinity, Does it really matter what the alkalinity is? Chlorine or bromine works better with a low PH, and when your PH gets high the sanitizer gets less effective. Now the alkalinity is something that if kept low and I mean below 50PPM your equipment is susceptible to erosion or just plain old out getting eaten up by the low alkalinity. Do whatever makes you feel more comfortable, pool guys are just like doctors, we all have our own opinion, find somebody that you trust and stick with them, somebody who actually sees your pool or spa more than likely is better off. Thanks