Pool Chemical | Cheat Sheet [extra Quality]

Taped to the bottom, in a different handwriting (Henley’s, maybe), were the emergency haikus:

Free Chlorine (FC): Your knight. 1–4 ppm. Combined Chlorine (CC): The monster your knight has already slain. If CC > 0.5 ppm, you smell "chlorine." That's not chlorine. That's chloramine—the stench of victory rotting. pool chemical cheat sheet

Cyanuric Acid (CYA): Sunscreen for chlorine. 30–50 ppm. Above 100 ppm? You've built a prison. Chlorine can't escape, but it can't work either. Only draining the pool sets it free. Taped to the bottom, in a different handwriting

Using a pool chemical cheat sheet offers several benefits, including: If CC > 0

Often called "sunscreen for chlorine." Without Cyanuric Acid (CYA), the sun can burn off your chlorine in just a few hours. 2. The Maintenance Math When your levels are off, here is how you fix them:

The day the water turned emerald green was the day Mark realized he’d been treating his pool like a bathtub. He’d been lucky for two summers—dump in a little chlorine, run the filter, swim. But this year, the algae laughed at him. It wasn't just green; it was thick , a viscous bloom that looked like someone had liquefied a golf course.