Inputs used
Assumptions for this answer.
- Pool volume
- 30,000 gal
- Current free chlorine
- 2 ppm
- Shock target
- 12 ppm
- Product
- 10% liquid chlorine
Pool answer
How much shock for a 30,000 gallon pool?
For a 30,000 gallon pool, raising free chlorine from 2 ppm to 12 ppm takes about 3.0 gal of 10% liquid chlorine.
Customize in the Pool Shock CalculatorAnswer table
Calculated result.
Free chlorine raise 10 ppm
10% liquid chlorine 3.0 gal
Pure chlorine equivalent 2.5 lb
Formula
The math behind this answer.
Shock product amount = pool gallons x ppm increase x 0.00000834 / product strength
Substituted values
30,000 gal x 10 ppm x 0.00000834 / 0.10 / 8.34 = 3.0 gal liquid chlorine
Related calculators
Adjust the answer for your pool.
These answer pages use fixed assumptions. The calculators let you change gallons, readings, products, and targets.
Pool Shock Calculator Estimate a shock dose from pool gallons, current free chlorine, target ppm, and product strength. Pool Chlorine Calculator Estimate how much liquid chlorine, bleach, or cal-hypo to add from pool gallons and your target free chlorine raise. Pool Stabilizer Calculator Estimate cyanuric acid stabilizer to add from pool gallons, current CYA ppm, and target CYA ppm.
Answer FAQ
Common follow-up questions.
Use these answers to decide when the worked example is close enough and when to open the calculator.
How much liquid shock for a 30,000 gallon pool?
For this example, about 3.0 gal of 10% liquid chlorine. The actual amount changes with current chlorine, target chlorine, and product strength.
Does CYA affect shock amount?
CYA affects the target free chlorine you choose. Use the live shock calculator if you want a CYA-based planning target.
Can I use cal-hypo instead?
Yes, but cal-hypo uses a different product strength and can raise calcium hardness. Use the live calculator with the correct product selected.