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 your next call to the builder.

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 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 to correct, and explains whether salt water is actually corrosive at pool concentrations.

The episode closes with a full, step by step remediation protocol for anyone dealing with an active metal stain right now, including when algaecide is the right call and when it isn't.

If you've ever stared at a purple pool and had no idea why, this one's for you.

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.

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.

From the water level rule that protects a vinyl liner's own shape, to why a fiberglass shell depends on its own water as ballast, to the buffer that lets plaster forgive a bad winter and the two ways that forgiveness runs out, this is the chemistry most closing guides leave out entirely.

Four companion guides, one for each pool type, are linked in the show notes for the complete protocol.

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.