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 Legionella and Pseudomonas.

Then hot water and the Langelier Saturation Index, total dissolved solids, equipment by tub type, and the biofilm hiding in the plumbing.

You’ll leave with a standard you can explain, number by number.

Show notes and free resources at PoolsScientific.com. Subscribe to the weekly email list for episode updates. Ebooks available at payhip.com/poolsscientific. Follow us on Instagram @poolsscientific24. The Pools Scientific Podcast is produced by Pools Scientific LLC — Elevated Pool Care Through Science and Technology.

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 winter, why so many pools open green in spring, and the month by month plan for testing pool water in winter, from October closing through March.

If you’ve wondered how to winterize a pool so the surface survives, start here.

Show notes and free resources at PoolsScientific.com. Subscribe to the weekly email list for episode updates. Ebooks available at payhip.com/poolsscientific. Follow us on Instagram @poolsscientific24. The Pools Scientific Podcast is produced by Pools Scientific LLC — Elevated Pool Care Through Science and Technology.

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, why it migrates to the surface, what it does when it gets there, and how the LSI determines whether your water is accelerating that process or allowing the plaster to stabilize.

The fix exists. It's documented. It's been in use in other industries for decades. This episode explains why your pool contractor has almost certainly never mentioned it.

Show notes and free resources at PoolsScientific.com. Subscribe to the weekly email list for episode updates. Ebooks available at payhip.com/poolsscientific. Follow us on Instagram @poolsscientific24. The Pools Scientific Podcast is produced by Pools Scientific LLC — Elevated Pool Care Through Science and Technology.