Pool Shock Calculator
poolPool Chemistry
scienceDosage Instructions
Accurate Pool Shock Dosing
Keeping your pool crystal clear requires precise chemical balance. "Shocking" involves adding a large dose of chlorine to break down organic waste, kill algae, and remove chloramines. Our Pool Shock Calculator tells you exactly how much product to add based on your pool size and current chlorine readings.
Types of Shock
- Calcium Hypochlorite (Cal-Hypo): The most common granular shock. Powerful (65%+) but dissolves slowly and adds calcium.
- Dichlor: Stabilized granular shock. Dissolves fast and adds Cyanuric Acid (Stabilizer). Good for maintenance but watch your CYA levels.
- Liquid Chlorine: Easy to use and mixes instantly. Does not add calcium or stabilizer.
Safety First
Always follow the "bucket method": pre-dissolve granular shock in a bucket of water before pouring it into the pool to prevent bleaching your liner. Wear gloves and eye protection when handling concentrated chemicals.
Frequently Asked Questions
When should I shock my pool?
You should shock your pool once a week during peak summer usage, after heavy rainstorms, or whenever Combined Chlorine (CC) levels rise above 0.5 ppm.
How much shock do I need for a green pool?
For a green pool with visible algae, you may need to "double shock" or "triple shock," raising Free Chlorine levels to 20-30 ppm until the algae is dead.
Can I swim immediately after shocking?
No. You should wait until the Free Chlorine level drops back down to safe swimming range (typically 1-4 ppm), which usually takes 12-24 hours.