Hi everyone,
I have a question on the saturation index. The goal is to keep it close to 0 as possible, but how much of an excursion can be tolerated before you start to have issues? I've heard values between -0.5 (corrosive) to +0.5 (scale forming) is an acceptable range.

What do the experts here think? I find it difficult to try to keep it at 0 unless you check the water everyday which I can't do. I can only check it every weekend.