Hot Tub Shock Calculator

Calculate shock dosage for your hot tub based on volume and shock type.

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Recommended Levels

See the full reference chart:

Quick tips

When to shock a hot tub: Weekly or after heavy use. Use spa shock (MPS or chlorine). Run jets 15–20 minutes. Wait until chlorine drops to 3–5 ppm before using.

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WaterBalanceTools provides practical calculators and guides for pool and hot tub water chemistry. These tools are designed to help maintain safe chlorine, pH, and total alkalinity within a healthy water balance.