May 5, 2026 · 30 min · 10 segments
There is one calculation that determines whether your pool water is slowly destroying your equipment, etching your plaster, or quietly depositing scale on every surface it touches. Most pool owners…
We get calls regularly, pool owners reaching out because something is wrong with their pool.
In my experience, across every one of those calls, across every site visit, across every pool I've looked at where unexplained damage was happening, the cause is always the same, without exception.
It is always water that is out of balance, water that has an LSI that is either too low or too high, sustained over months or years, silently attacking every surface and component it touches.
A pool that has been running with corrosive water for two years, it doesn't look corroded.
It looks like a pool until the day it doesn't, until the plaster starts roughing up, the grout starts to crumble, until you get a heater repair quote that makes your eyes water, until your salt cell dies two years early, until you're writing a huge check for a full replaster on a pool that should have had another fifteen or twenty years of life in it.
You can fix it, expensively, and you can prevent it from continuing, but the damage stays done, every dollar of it.
Not because it's an interesting chemistry concept, though it genuinely is, but because understanding it is the single most effective thing a pool owner or a pool professional can do to protect that investment.
The difference between a salt cell that runs for eight years and one that fails in two.
It is full stop the most important number in pool care that most owners have never been told to calculate.
We get calls regularly, pool owners reaching out because something is wrong with their pool.
In my experience, across every one of those calls, across every site visit, across every pool I've looked at where unexplained damage was happening, the cause is always the same, without exception.
It is always water that is out of balance, water that has an LSI that is either too low or too high, sustained over months or years, silently attacking every surface and component it touches.
A pool that has been running with corrosive water for two years, it doesn't look corroded.
It looks like a pool until the day it doesn't, until the plaster starts roughing up, the grout starts to crumble, until you get a heater repair quote that makes your eyes water, until your salt cell dies two years early, until you're writing a huge check for a full replaster on a pool that should have had another fifteen or twenty years of life in it.
You can fix it, expensively, and you can prevent it from continuing, but the damage stays done, every dollar of it.
Not because it's an interesting chemistry concept, though it genuinely is, but because understanding it is the single most effective thing a pool owner or a pool professional can do to protect that investment.
The difference between a salt cell that runs for eight years and one that fails in two.
It is full stop the most important number in pool care that most owners have never been told to calculate.
Every episode on Radar is fully transcribed, speaker-labeled, and rich with metadata. Here is a taste of this one. Try Radar for free to see the rest.
The rest of this transcript — segmented and speaker-labeled, so you land on the exact moment something was said
All 10 segments — the transcript broken into labeled sections, every ad read marked
All 25 topics — jump to every other episode discussing the same subject
Every related episode — other shows Radar links to this one
No account is needed to search Radar.
