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SLAM Calculator (Shock Level FC)

Enter your pool volume, CYA, and current FC. We’ll calculate your target SLAM chlorine level and how much liquid chlorine to add.

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Tip: If you’re not sure, use the Pool Volume Calculator first.
Use your current test result.
This is your FC right now.
Pick the product you’re actually using.

Results

Fill in your numbers, then hit Calculate. Your inputs are saved automatically on this device.

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Safety note: Don’t mix chemicals. Add chlorine with the pump running. For vinyl liners, avoid letting strong chlorine sit on the floor. If your CYA is very high, lowering CYA first may be a better plan than running an extreme SLAM level.

What is SLAM?

SLAM stands for Shock Level And Maintain. It’s a method of clearing algae and restoring water clarity by raising Free Chlorine (FC) to a target level based on your CYA (stabilizer) and then maintaining that level until the pool is clean.

How to Use This SLAM Calculator

1) Enter your pool volume in gallons. 2) Choose your CYA. 3) Enter your current FC. 4) Select your chlorine strength. Click Calculate to see your target SLAM FC and how much liquid chlorine to add.

Common Questions

Does SLAM mean one big chlorine dump? No. The “Maintain” part matters most. You test and re-dose to keep FC at target.

Do I need to brush and filter? Yes. Brushing and filtration are part of clearing the pool.

Do SLAM levels change? Yes—your SLAM target depends on CYA. Higher CYA = higher target FC.

Try Other PoolToolkit Tools

Pool Volume Calculator • Chlorine Dose Calculator • All Tools
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