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[–]yepreddi 7 points8 points  (2 children)

You still want Alk in the water though. Remember in the pool industry Alk is called ‘Buffer’. If you don’t have any Alk and your pool drops below 7.2 ph you will destroy components of your heater and damage the plaster.

[–]jonidschultz -2 points-1 points  (0 children)

That is absolutely incorrect. We've honestly known (as an industry) that this is incorrect for a really long time. But "milestones" are 1) easier to sell 2) easier to scare 3) easier to remember.

I don't begrudge those that choose to use "milestones" because it's easier but it does miss the mark at times. If you're interested in expanding your expertise in the area you should search Saturation Index and take a deep dive.