Hot Tub Shock Calculator
Calculate shock dosage for your hot tub based on volume and shock type.
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- Spa Volume Calculator
- Hot tub chemicals — 200 gal
- Hot tub chemicals — 300 gal
- Hot tub chemicals — 400 gal
- Hot tub chemicals — 500 gal
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Recommended Levels
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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.
- Typical range: 1–3 ppm chlorine
- Recommended pH: 7.2–7.6
- Test water regularly
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.
Last updated: April 2026