Expert Verified Updated: March 2026

Trichlor Pool Shock Calculator

The most concentrated chlorine form. Best used for slow-release sanitation, but critical to calculate correctly to avoid extreme acidity.

Quick Conclusion
To raise Free Chlorine (FC) by 10 ppm in a 10,000-gallon pool, use only 0.9 lbs of Trichlor. Warning: Trichlor is extremely acidic (pH 2.9) and adds 6 ppm of CYA per 10 ppm of FC.

Technical Comparison

Chlorine Form Available Chlorine pH Level
Trichlor (Pucks) 90% 2.9 (High Acid)
Dichlor (Shock) 56-62% 6.7 (Neutral-ish)
Bleach (Liquid) 10-12% 11-13 (Basic)

Actionable Steps

Pro-Tip

The "Vacation" Trick: Trichlor is perfect for when you leave town. Load the feeder, set it to low, and it will keep your pool sanitized for a week. For daily use, however, Liquid Chlorine is the healthier long-term choice for your pool's lifespan.

Frequently Asked Questions

Can I use it in vinyl?

No, it's very acidic and can bleach or damage vinyl liners if not pre-dissolved and broadcast carefully.

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