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The Pools Scientific Podcast: Daily Summaries Delivered
by John Cooper
The Pools Scientific Podcast is the only science-based pool care podcast hosted by a credentialed engineer. John Cooper — M.S. Nuclear Engineering, B.S. Chemical Engineering, U.S. Navy Nuclear Operator and submarine veteran, and five-time PHTA certified professional — breaks down pool water chemistry, the Langelier Saturation Index, salt chlorine generators, CYA management, water balance, and everything in between. Built for pool owners who want to understand their water, service professionals who want to sharpen their science, and pool company owners who want a knowledge-based competitive edge. New episode every Tuesday. PoolsScientific.com
Latest Episodes
The most recent episodes — sign up to get AI-powered summaries of each one.
- 1 weeks ago19 min
Episode 28: What Else Could Possibly Go Wrong in Your Pool in Winter? Crystals, Ice, and Other Winter Surprises | The Pools Scientific Podcast
Winter is hard on a pool, and not all of it is explained. This episode sorts what can go wrong under the cover into three piles: Known, Theory, and Shrug. John Cooper starts with the calcium crystals that appear on some plaster pools in spring and gives both published explanations a fair hearing, from Orenda Technologies and onBalance. Then winter dust, gypsum, the odd formations on drain covers, and one pool that opened with a layer of white dust and a pH of 9.2. Then the damage that is comp...
- 2 weeks ago24 min
Episode 27: Hot Tub Chemistry: Bromine vs Chlorine and Why Your Hot Tub Isn’t Just a Small Pool | The Pools Scientific Podcast
Your hot tub is not a small pool, and treating it like one is where most of the trouble starts. In this episode, John walks through why a tub is a different animal: more bathers per gallon, water held at 104 degrees Fahrenheit (40 degrees Celsius), and nowhere for anything to go. We cover bromine vs chlorine and how to choose, why dichlor, the jar most pool stores hand you for a spa, quietly builds cyanuric acid until the sanitizer stops doing its job, and what the CDC says about ...
- 3 weeks ago32 min
Episode 26: Winter Pool Maintenance: What the Water Does to Your Pool Under the Cover | The Pools Scientific Podcast
Winter pool maintenance is where most pool damage starts, and almost nobody does it. Once the cover goes on, the water sits against the plaster, gelcoat, or vinyl liner for about six months, and cold water changes the chemistry in ways the summer rules don’t cover. John walks through what happens under the cover, why winter pool chemistry runs on the LSI instead of the in season numbers, and what a pool closing kit leaves out. You’ll hear what causes plaster etching in winte...
- 4 weeks ago15 min
Episode 25: Pool Plaster Mottling: Causes, Chemistry, and the Real Fix |The Pools Scientific Podcast
Pool plaster mottling is one of the most common complaints in new pool construction, and the industry's standard explanation, installer error or bad water chemistry, is usually wrong. The real cause is calcium hydroxide migration during cement cure, and it has been a solved problem in commercial concrete construction since the 1950s. The pool industry just never picked it up. This episode covers the full mechanism: how Portland cement produces calcium hydroxide as a hydration byproduct,...
- Sep 29, 202618 min
Episode 24: The Four-Year Lie — What Your Plaster Is Trying to Tell You | The Pools Scientific Podcast
Pool plaster mottling gets blamed on your water chemistry almost every time. This episode asks a different question. What if the uneven gray discoloration was decided before the pool ever held a drop of water? We get into the science of new pool plaster problems, and what pool plaster warranty coverage actually protects you from, and what it does not. If your plaster is showing discoloration and mottling in the first few years, you are going to want to hear this one before y...
- Sep 22, 202629 min
Episode 23: Metal Staining and the Ecosystem of Metals in Pool Water | The Pools Scientific Podcast
Pool metal stains rarely come from just one source, and this episode walks through the real chemistry behind them. John covers where metals and minerals actually enter pool water, why iron, manganese, and copper stain differently, and why calcium and magnesium follow the same solubility rules everyone assumes are unique to metals. He breaks down the difference between a sequestrant and a chelator, walks through a rare copper cyanurate case that took fifteen drain and refill cycles...
- Sep 17, 202626 min
Bonus Episode 3: Closing and Winterizing Your Pool | The Pools Scientific Podcast
Closing day is the last time anyone touches your pool's chemistry until spring, and most closing checklists skip the one thing that actually matters: what happens to that water for the next five months. This episode covers pool closing chemistry by pool type, since winterizing an above ground pool, winterizing an inground pool, vinyl liner pool winterizing, fiberglass pool closing, and plaster pool winterizing each carry a different physical risk, not just a different checklist. F...
- Sep 15, 202618 min
Episode 22: Beyond the Pool Store | The Pools Scientific Podcast
Why does that sharp chemical smell at the pool mean your chlorine is losing, not winning? This episode breaks down the real chemistry behind combined chlorine and chloramines, the actual mechanism behind the seven and a half percent chlorine-to-cyanuric-acid ratio, and why a fixed LSI range can turn against your pool's plaster and equipment without warning. Includes a real two-year, zero-CYA field experiment on salt pools, and why some of the most repeated advice at the pool store...
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About The Pools Scientific Podcast
The Pools Scientific Podcast is the only science-based pool care podcast hosted by a credentialed engineer. John Cooper — M.S. Nuclear Engineering, B.S. Chemical Engineering, U.S. Navy Nuclear Operator and submarine veteran, and five-time PHTA certified professional — breaks down pool water chemistry, the Langelier Saturation Index, salt chlorine generators, CYA management, water balance, and everything in between. Built for pool owners who want to understand their water, service professionals who want to sharpen their science, and pool company owners who want a knowledge-based competitive edge. New episode every Tuesday. PoolsScientific.com
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Frequently Asked Questions
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