Why Pool Care Is a Science Problem

Welcome to the Pools Scientific Podcast, Elevated Pool Care through science and technology. I'm John Cooper, and whether you own a pool, service them, or run a company, this show is built for you. Real Chemistry, Real Answers, every Tuesday. A few years back, I got a call from another pool guy. He'd been working a job that was beyond what he knew how to handle, and he needed someone to come in and help him sort it out. The client was an extremely successful attorney. He had a beautiful home, and he'd trusted this other pool company completely. So I show up and I walk into the equipment room. Now I've seen a lot of equipment rooms.

After years of pool work and before that, a career managing complex mechanical systems on a nuclear submarine, I've developed what you might call a calibrated eye for this isn't right. The room had flooded. The water main into the house, a two inch copper pipe, had burst. Everything in that room, the pump, the filter, the heater, the automation system, the electrical panels, all of it had been sitting in water. We're talking a complete ripout and rebuild. New everything. But that wasn't even the worst part. As I started to trace the plumbing, because you can't rebuild something until you understand what was there, I found myself staring at something I'd never seen in a residential pool installation in my life.

One of the pressure lines, a pipe carrying pressurized water through the system, was made out of electrical conduit. No, not PVC pressure pipe, not CPVC, not copper. Electrical conduit. The stuff you're unwiring through. Electrical conduit is not pressurated. It's not designed to hold water under pressure at all. It's not approved for plumbing applications, period. It's not safe. And someone, a professional, a person who'd been paid to do this work, someone this attorney had trusted completely, had looked at electrical conduit and thought, yeah, that'll work. The attorney had no idea. He was a smart man, brilliant even in his own field, but pool plumbing isn't his field.

So he trusted. And what he got for that trust was another opportunity for a flooded equipment room and destroyed equipment. Because a pipe in his system that wasn't actually a pipe could have failed catastrophically. I mean, if you're gonna put yourself out there with out of code compliance plumbing work, maybe make sure it isn't at a lawyer's house. Here's what I want you to take from the story before we go any further. The pool industry in many corners does not have a knowledge problem. It has a standards problem. There are people doing this work who don't know what they don't know. And the people paying them, the homeowners, the facility managers, the business owners who outsource their pool care, they have no way of knowing either.

That is exactly why I started Pool Scientific. And it's exactly why this podcast exists. My name is John Cooper. I'm the founder of Pools Scientific, a science based pool care company. And before I tell you what this show is and what we're going to cover, I want to tell you a little bit about who I am, because in a space where anyone can call themselves a pool expert, I think credentials matter. I hold a Master of Science in Nuclear Engineering and a Bachelor of Science in Chemical Engineering. I served in the United States Navy as a nuclear operator. If you know anything about submarines, you know that water quality on a nuclear boat is not a casual concern.

We managed water chemistry in closed systems under extreme conditions. Precision wasn't optional, it was life or death. When I transitioned out of the Navy and eventually into the pool industry, I approached it the same way I approach everything else, with a scientific framework. I earned my certified pool operator certification, my certified pool inspector certification, my certified maintenance specialist, my certified service technician, and my certified service professional designations all through the pool and hot tub alliance. That's not a flex, that's context. Because what I found when I entered this industry is that pool care, real pool care done correctly, is a chemistry and engineering problem. It's not a guessing game, it's not throw some shock in it and call it a day.

It's a dynamic system with multiple interacting variables, and if you don't understand the science, you will make mistakes, sometimes expensive ones, sometimes dangerous ones. I also want to be clear about something. I didn't start this podcast to talk down to pool owners or imply that everyone in the industry is incompetent. There are brilliant, talented people doing exceptional pool work. Some of them will be guests on this show. What I'm here to do is raise the floor, bring the science forward, give pool owners, whether you're a homeowner with a backyard pool, a service professional with a route full of clients, or a pool company owner building a business, I want to give all of you access to the kind of knowledge that usually lives inside engineering textbooks and certification manuals.

And I want to make it useful, make it actionable, make it something you can actually apply to the water in front of you. That's the mission. It's always been the mission of pool scientific, and now it has a podcast.

So let me ask you a question. When you think about maintaining a pool, what do you think the job actually is? If you're like most people, the answer is something like keep the water clear, keep the chlorine right, maybe test it once a week, maybe add some algicide if it starts turning green. And that's not wrong exactly, but it is incomplete. And the gap between that answer and the full picture is where most pool problems live. Here's how I think about it. Pool water is a chemical system. No, that's not a metaphor, literally a chemical system. You have water, you have dissolved solids, you have a sanitizer, usually chlorine, you have pH, you have total alkalinity acting as a buffer, you have calcium hardness, you have cyanuric acid if you're outdoors.

You have water temperature and bather load and evaporation and dilution and chemical demand. All of these variables interact with each other. Change one and the others shift. That's not a pool problem, that's chemistry. That's just how chemical systems work. The single most important concept in pool water chemistry, and we will come back to this over and over throughout this podcast, is called the Langular Saturation Index, the LSI. The LSI is a mathematical expression of water balance. It tells you whether your pool water is corrosive, meaning it will attack your equipment, your plaster, your pipes, your vinyl liner, your fiberglass shell, or whether it's scale forming, meaning it will deposit calcium carbonate on every surface it touches.

Neither extreme is good. The goal is balanced water, water that is neither hungry nor oversaturated. Now here's where it gets interesting. Most pool owners, and frankly, a lot of pool service professionals, are not even testing for the LSI. They're testing pH, they're testing chlorine, maybe alkalinity and calcium, but they're not running the full calculation. They're not looking at the complete picture. I have seen pools that look perfectly clear, sparkling, beautiful, not a hint of algae, that were slowly etching the plaster off the walls. Corrosive water doesn't look cloudy, it looks fine. Until your plaster starts roughing up, or until your heat exchanger starts corroding, until you're writing a thirty thousand dollar check for a replaster job, or spending eight thousand dollars on a heater replacement that could have been prevented by understanding just one number.

I've also seen pools that were scaling so badly that the owner couldn't figure out why their filter was clogging every few weeks. White deposits on the tile line, roughness on the returns, a pump that was working twice as hard as it should because the system was fighting calcium deposits. Water balance, that's the job. Not just keep the chlorine right. Water balance.

Let me give you another piece of this, the one that surprises people most. Chlorine is not just chlorine. What I mean is this, the effectiveness of chlorine as a sanitizer, its ability to actually kill bacteria and pathogens, is directly mathematically tied to the pH of the water. At a pH of 7.5, roughly forty eight to fifty percent of your free chlorine is in the active sanitizing form called hypochlorous acid. That's the form that works. That's the molecular shape that can penetrate a cell wall and destroy a microorganism. Push that pH up to 8.0, your active chlorine drops to around 22%. You've just lost more than half of your sanitizer's effectiveness.

At a pH of 8.5, which I see in pools all the time, you're down to about 9%. You're essentially running your pool on a fraction of what you're paying for. Now, there's a related concept I want to plant a seed on before we wrap this segment because we're going to build an entire episode around it next week. It's called the 7.5% rule. It's about the relationship between cyanuric acid, CYA, the stabilizer in your outdoor pool, and free chlorine. The short version is this your free chlorine level needs to be maintained at a minimum of 7.5% of your CYA concentration to actually be effective. If your CYA is high and your chlorine is low relative to it, you don't actually have working sanitizer, even if the test strip says so.

It's one of the most misunderstood dynamics in residential pool care and it deserves its own episode. The point I want you to leave this segment with is this. Pool care looks simple from the outside. Add chemicals, test the water, run the pump. But underneath that simplicity is a genuinely complex chemical system, and the people who understand that system really understand it at the molecular and mathematical level. Those people have pools that don't have problems. The plaster lasts longer, their equipment lasts longer. Their water is actually safe, not just clear. That's the difference between pool care and pool science, and that's the distinction that this podcast is built on.

So let me tell you what this show is going to be. Every week we're going to publish a new episode right here on the Pools Scientific Podcast. Sometimes it'll be me, solo, breaking down a chemistry concept or a technical topic. Sometimes we'll have guests, pool service professionals, equipment manufacturers, sales reps, PhTA certified instructors, aquatics directors, even business owners, people who are doing exceptional work in this industry, and who have something real to teach. We'll do Q ⁇ A episodes where I take questions from you, the listeners. Those questions can come through our Instagram at Pool Scientific twenty four, through our website at poolsscientific.com, or through our email list, which I'll tell you about in just a bit.

And we'll do case studies. Real pool problems, real diagnoses, real solutions. Exactly the kind of thing I walked you through in the top of this episode. Now, I want to speak directly to three different types of people for a moment, because this podcast is built for all three. One, if you're a pool owner, a homeowner with a backyard pool, someone who wants to actually understand what's happening in your water, and stop just hoping the chemicals are right, this show is for you. You're going to leave every episode knowing something concrete and useful about your pool. Two, if you're a pool service professional, a pool guy, a technician, a CPO, someone who's building a route, this show is for you.

We're going to go deep on the chemistry and the technical side in a way that most pool content simply doesn't. You're going to be able to explain to your clients why you do what you do. That's worth something. And three, if you're a pool company owner, someone running a business, thinking about growth, trying to build systems that scale, this show is for you too. We're going to talk business, chemistry and business, because you can't have a great pool company without both. There is no other podcast doing what this show is going to do. That's not arrogance. It's just a fact. Pool content online is dominated by YouTube videos from guys who mean well but aren't coming at this from a scientific framework.

That's the gap this show fills. And over the next year, my goal is simple make this the most trusted resource in the pool industry. The show that pool pros recommend to their clients, the show that new pool owners find when they're first trying to figure out what they're doing. The show that raises the floor for everyone.

So before I let you go, I want to point you toward a few things. First, the email list. If you go to poolsscientific.com and sign up, you're going to get a weekly email from me every time a new episode drops. I keep those emails short and useful. The main point from the episode, maybe a tip or a follow-up, and the link to listen. No spam, no nonsense, just pool science once a week in your inbox. Second, if you're a pool owner who wants to go deeper right now, I've written a three-volume ebook series called the Pool Scientific Guide to Pool Care. Volume one is for pool owners who want to understand the fundamentals, chemistry basics, what you should actually be testing for, how to brush your pool, and how to stop guessing.

Volume two goes deeper into the chemistry. We're talking LSI, water balance, advanced troubleshooting. Volume three is professional level material, equipment, automation, salt systems, plaster curation, cold climate management. All three ebooks are available at payhip.comslash poolscientific. There's a link in the show notes. Third, come find us on Instagram at PoolScientific twenty four. And if you're in a Facebook pool group, share this episode. Seriously. There are pool owners in those groups asking the same questions over and over because they don't have access to good information. This show is free, send it to them.

Like I said, next week we're going to dig into the 7.5% rule, the relationship between cyanuric acid and free chlorine, and why millions of pool owners are running their sanitizer at a fraction of its actual effectiveness without even knowing it. It's a solo episode, just me, and it's going to be really practical. Come back for it. I'm John Cooper. This is the Pools Scientific Podcast, elevated pool care through science and technology.

Thank you for listening to the Pools Scientific Podcast. If this episode provided value, please share it with someone who takes their pool seriously. Next Tuesday, we'll go even deeper. Until next time, enjoy your pool.