Pool Chemical Cheat Sheet |verified| Today

Mark had always thought a strong chemical smell meant a clean pool. The sheet taught him it meant a dirty pool. The smell was the pool begging for more shock to burn off the used-up fighters. He learned the 10x rule: to break chloramines, you need 10 times the CC level in free chlorine. His CC was 1.0. He added 10 ppm of calcium hypochlorite. The next morning, the green was gone. The water was cloudy, but the green was gone.

These are the numbers you should check at least twice a week.

Next, a drawing of two ghosts.

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

By having this information readily available, pool owners and operators can quickly and easily determine the correct chemical dosages and make adjustments as needed. pool chemical cheat sheet

He understood now. A pool isn't a bucket of water. It's a living chemistry set. It’s a covenant between pH and chlorine, a war against invisible invaders, a constant negotiation with the sun. The cheat sheet wasn't instructions. It was a map of a fragile kingdom—his kingdom—and for the first time, he knew how to be a decent king.

This is your primary sanitizer. It kills bacteria and prevents algae. If it drops below 1.0, your pool is "unprotected." Mark had always thought a strong chemical smell

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.

Calcium Hardness (200–400 ppm): Too low, and the water eats your plaster like a sugar cube. Too high, and it rains scale—white flakes of regret on your tile line. He learned the 10x rule: to break chloramines,