I try to avoid dealing with spas.

The bather load to gallons ratio, plus the light of sunlight, plus the high temperature mean that successful spa operation is much harder and much less certain than pool ops. Ironically, spa owners tend to be much less 'train-able' since they intuitively assume that "smaller" = "easier than a pool".

I realized this summer, I'm going to have to make some changes because attached spas have become so common. But, it's doubtful we'll embrace standalone spas. I'd rather we focus on what we can do very well and not get involved in doing what nobody can do exceptionally well.

So I have my opinions about those recommendations (they clearly incorporate at least one of my ideas -- aeration to strip alk), but I don't have the experience to know if I'd be right, or whether Nitro is right. And, I have no plans to go seek that experience.

So my main goal was just to make sure no one reading this thread later, assumed we were recommending or endorsing (or rejecting!) those recommendations. Ironically, I see that the edit I was trying to make, does not appear. So, I'll fix that.